NEWS

Bestech Systems Signs Strategic Partnership with zSpace and Holds Partner Day Event

Bestech System (CEO Seo Woo-seung) announced that it held a strategic partnership signing ceremony and a Partner Day event on the 18th to foster business cooperation for its Extended Reality (XR) education solution, ‘zSpace.’

The company has signed partnerships with various solution-owning companies, including MC Media Solution, iNet Hosting, Kyunghee Information Tech, DHsys, Lara Soft, Sam Corporation, and Future Center. Bestech System anticipates significant mutual synergy effects as it conducts zSpace business with these companies.

At the event, attended by representatives from partner companies, Bestech System presented business strategies and direction, partner operation policies and sales strategies, an introduction to the partner program, and an introduction to zSpace.

CEO Seo Woo-seung stated, “By recruiting companies with accumulated know-how in various solutions as strategic partners, we can focus more on expanding the zSpace business.” He added, “Based on our partner policy, we will support partners in maximizing their capabilities and expertise by strengthening sales, marketing, and technical training.”

Bestech Systems entered the edutech business last January after signing a contract as the exclusive domestic partner of zSpace, a global edutech company. The company is currently supplying VR and AR-related content and hardware to the domestic market.


Source – Ahn Min-soo, “Bestech Systems Signs Strategic Partnership with zSpace and Holds Partner Day Event,” Electronic Times, May 20, 2020, https://www.etnews.com/20200520000106

High school

Life sciences Paid content
Activity Name Applicable Grade Unit Name
Anatomy Inquiry: Respiratory System High School 2nd Year (2) Human Metabolism
Anatomy Inquiry: Circulatory System High School 2nd Year (2) Human Metabolism
Anatomy Inquiry: Digestive System High School 2nd Year (2) Human Metabolism
Anatomy Inquiry: Excretory System 11th Grade (2) Human Metabolism
Anatomy Inquiry: Nervous System 11th Grade (3) Homeostasis and Body Regulation
Exploring Human Reactions to Influenza 11th Grade (3) Homeostasis and Body Regulation
Human Reactions to Influenza 12th Grade (3) Homeostasis and Body Regulation
Exploring the Relationship Between Predator and Prey 11th Grade (5) Ecosystems and Interactions
Exploring the Relationship Between Predator and Prey 11th Grade (5) Interaction with Ecosystems
Ecosystem Exploration: Interactions Between Organisms 11th Grade (5) Interaction with Ecosystems
Exploring the Relationship Between Predator and Prey 11th Grade (5) Interaction with Ecosystems
Ecosystem Exploration: Energy Pyramid 11th Grade (5) Interaction with Ecosystems
Flu Test 12th Grade (6) Biotechnology and Human Life

Middle school

Life sciences Paid content
Activity Name Applicable Grade Unit Name
Plant Exploration: Plant Photosynthesis and Respiration Middle School 2nd Year (11) Plants and Energy
Plant Exploration: Plant Reproduction Middle School 2nd Year (11) Plants and Energy

Elementary school

Life sciences Paid content
Activity Name Applicable Grade Unit Name
Plant Exploration: Plant Nutrition Grades 3~4 (13) The Life Cycle of Plants
How Animals Use Their Senses Grades 3~4 (10) The Life Cycle of Animals
Fish Structure and Function Grades 3~4 (10) The Life Cycle of Animals
Fish Structure and Exploring Functions Grades 3~4 (10) The Life Cycle of Animals
Structure and Function of Desert Organisms Grades 3~4 (10) The Life Cycle of Animals
Ecosystem Exploration: Diversity of Life Grades 5~6 (5) Organisms and Environment
Ecosystem Exploration: Movement of Problems Grades 5~6 (5) Organisms and Environment
Plant Exploration: Plant Structure and Function Grades 5~6 (12) Plants' Structure and Function

High school

Life sciences Built-in content
Activity Name Applicable Grade Unit Name
Changes in Bird Beaks High School 2nd Year (1) Understanding Life Science
Human Anatomy: Circulatory System High School 2nd Year (2) Human Metabolism
Human Anatomy: Respiratory System High School 2nd Year (2) Human Metabolism
Human Anatomy: Digestion System High School 2nd Year (2) Human Metabolism
Properties of Water High School 2nd Year (2) Human Metabolism
Monosaccharides and Disaccharides (Combined: Carbohydrates 1, 2, and 3) High School 2nd Year (2) Human Metabolism
Chemical Effects: Human Reactions High School 2nd Year (2) Human Metabolism
Chemical Effects: Ecological Interactions High School 2nd Year (2) Human Metabolism
Hormones and Neurotransmitters 11th Grade (2) Human Metabolism
Proteins 11th Grade (2) Human Metabolism
Lipids 11th Grade (2) Human Metabolism
High Molecules 11th Grade (2) Human Metabolism
High Molecules 11th Grade (2) Human Metabolism
Cell Theory 12th Grade (2) Cells Characteristics
Plant Cell vs. Animal Cell High School Senior (2) Characteristics of Cells
Chloroplasts and Mitochondria (Chloroplasts and Mitochondria) High School Senior (3) Cellular Respiration and Photosynthesis
Leaf Structure High School Senior (3) Cellular Respiration and Photosynthesis
Plant Cells and Chloroplasts High School Senior (3) Cellular Respiration and Photosynthesis
Plants and Photosynthesis High School Senior (3) Cellular Respiration and Photosynthesis
Glucose and Cellular Respiration High School Senior (3) Cellular Respiration and Photosynthesis
Human Anatomy: Nervous System High School Junior (3) Homeostasis and Body Regulation
Human Anatomy: Brain High School Junior (3) Homeostasis and Body Regulation
DNA: Gene Mutations High School Junior (4) Genetics
Are you a transporter? 11th Grade (4) Genetics
Sickle cell disease (cellular anemia) 11th Grade (4) Genetics
Skipping two traits 12th Grade (4) Gene expression and regulation
Gland flies 12th Grade (4) Gene expression and regulation
Trait modification in fruit flies 12th Grade (4) Gene expression and regulation
Fruit Fly Research High School Senior (4) Gene Expression and Regulation
Organic Structures High School Senior (5) Biological Evolution and Diversity
Skeleton Comparison High School Senior (5) Biological Evolution and Diversity
Idea Sheet: Skeleton High School Senior (5) Biological Evolution and Diversity
Embryonic Development High School Senior (5) Biological Evolution and Diversity
Botany: Angiosperm Coevolution High School Senior (5) Biological Evolution and Diversity
Botany: Flower Survey High School Senior (5) Biological Evolution and Diversity
Botany: Part of Flower Evaluation High School Senior (5) Biological Evolution and Diversity
Idea Sheet: Skeleton High School Senior (5) Biological Evolution and Diversity
Embryology High School Senior (5) Biological Evolution and Diversity
Evolution of Whales High School Senior (5) Biological Evolution and Diversity
Comparative Anatomy High School Senior (5) Biological Evolution and Diversity
Mating High School Senior (5) Biological Evolution and Diversity
Energy Flow Through Ecosystems (Energy Pyramid) High School Junior (5) Ecosystems and Interactions
Interactions in the Savannah 11th Grade (5) Interactions with Ecosystems
Carbon Cycle 11th Grade (5) Interactions with Ecosystems
Symbiotic Relationships 11th Grade (5) Interactions with Ecosystems
Where Did All the Honeybees Go? 11th Grade (5) Interactions with Ecosystems
Trophy Levels of the Energy Pyramid 11th Grade (5) Interactions with Ecosystems
Invasive Alien Species 11th Grade (5) Interaction with Ecosystems
Cell Showcase 12th Grade (6) Biotechnology and Human Life
Genetic Modification 12th Grade (6) Biotechnology and Human Life

Middle school

Life sciences Built-in content
Activity Name Applicable Grade Unit Name
Planting a Wall Middle School 2nd Year (11) Plants and Energy
Life Cycle of Ferns Middle School 2nd Year (11) Plants and Energy
Circulatory and Respiratory Systems Middle School 2nd Year (12) Animals and Energy
Digestive System Middle School 2nd Year (12) Animals and Energy
Food Processor Middle School 2nd Year (12) Animals and Energy
Exploring Seawater and Freshwater Biomes (Saltwater vs. Freshwater) Middle School 2nd Year (14) Hydrosphere and Ocean Circulation
The Journey of Water Middle School 2nd Year (14) Hydrosphere and Ocean Circulation
Global Warming and Arctic Sea Ice (Arctic: Sea Ice) Middle School 2nd Year (16) Disasters, Calamities, and Safety
Interactions in the Arctic (Combination) Middle School 2 (16) Disasters, Calamities, and Safety

Elementary school

Life sciences Built-in content
Activity Name Applicable Grade Unit Name
Parents and Children (Parents and Baby Animals) Grades 3~4 (3) Animal Life
Now You Look at Me, Now You Don't! Grades 3~4 (5) Biology and Environment
Fossil Clues Grades 3~4 (6) Strata and Fossils
African Grasslands: Fossil Research Grades 3~4 (6) Stratigraphy and Fossils
I Like Home Grades 3~4 (6) Stratigraphy and Fossils
A Paleontologist for a Day Grades 3~4 (6) Stratigraphy and Fossils
Let's Become a Dinosaur Detective Grades 3~4 (6) Stratigraphy and Fossils
Classification of Animals Grades 3~4 (10) Animals Life Cycle
Butterfly Life Cycle Grades 3-4 (10) Animal Life Cycle
Big Fish, Small Fish Grades 3-4 (10) Animal Life Cycle
Busy Honeybee Grades 3-4 (10) Animal Life Cycle
Swarm, Flight, or Float Grades 3-4 (10) Animal Life Cycle
Small Termite Grades 3-4 (10) Animal Life Cycle
Butterfly Life Cycle Grades 3-4 (10) Animal Life Cycle
Bird Beak and Foot Grades 3-4 (10) Animal Life Cycle
How Will Nature Solve This? Grades 3-4 (10) Animal Life Cycle
Insect Biomimicry (Bug Comparison) Grades 3-4 (10) Animal Life Cycle
Vertebrates and Invertebrates Grades 3~4 (10) Animal Life Cycle
What are Animals? Grades 3~4 (10) Animal Life Cycle
Insect Characteristics Grades 3~4 (10) Animal Life Cycle
Fish Characteristics Grades 3~4 (10) Animal Life Cycle
Reptile Characteristics Grades 3~4 (10) Animal Life Cycle
Reptile Characteristics Grades 3~4 (10) Animal Life Cycle
Characteristics of Amphibians Grades 3~4 (10) Animal Life Cycle
Flight Wings Grades 3~4 (10) Animal Life Cycle
Nocturnal Animals (Night Bumps) 3rd~4th Grade (10) Animal Life Cycle
Bird Characteristics (How Do Birds Fly?) 3rd~4th Grade (10) Animal Life Cycle
Animal Defense 3rd~4th Grade (10) Animal Life Cycle
Animal Teeth and Diet 3rd~4th Grade (10) Animal Life Cycle
What Happened Here? Grades 3-4 (10) Animal Life Cycle
Characteristics of Mammals Grades 3-4 (10) Animal Life Cycle
Structure and Function: Mammal Skull Grades 3-4 (10) Animal Life Cycle
Endangered or Extinct Grades 3-4 (10) Animal Life Cycle
Did you eat lima beans today? Grades 3-4 (13) Plants' Life Cycle
Pollination and Seed Dispersion (Bound) Grades 3~4 (13) Life Cycle of Plants
Plant Adaptation Grades 3~4 (13) Life Cycle of Plants
Fun Insectivorous Animals! Grades 5~6 (4) Diverse Organisms and Our Lives
Habitat Exploration (Ecosystem Exploration) Grades 5~6 (5) Organisms and the Environment
Travel to the African Grasslands (Integrated) 5th~6th Grade (5) Biology and Environment
Ocean Trip 5th~6th Grade (5) Biology and Environment
Desert Trip (Integrated) 5th~6th Grade (5) Biology and Environment
Journey to the Mild Forest (Integrated) 5th~6th Grade (5) Biology and Environment
Sensory Information of the Desert (Desert: Rattlesnake vs. Mouse 5th~6th Grade (5) Biology and the Environment
Endangered or Extinction Grades 5~6 (5) Biology and the Environment
Human Impact on the Environment Grades 5~6 (5) Biology and the Environment
Nature vs. Artificial Grades 5~6 (5) Biology and the Environment
Renewable Energy and Non-Renewable Energy: Solar Panels Grades 5~6 (5) Biology and the Environment
Renewable Energy and Non-Renewable Energy: Waterwheels and Hydropower 5th~6th Grade (5) Organisms and the Environment
Predators and Prey 5th~6th Grade (5) Organisms and the Environment
Food Chains in Ecosystems 5th~6th Grade (5) Organisms and the Environment
Leaf Modifications 5th~6th Grade (12) Structure and Function of Plants
Trees: Coniferous Forests and Deciduous Trees 5th~6th Grade (12) Structure and Function of Plants Function
Through the Camera's Eye Grades 5~6 (16) Structure and Function of Our Body
Why Do We Need Food? Grades 5~6 (16) Structure and Function of Our Body
Making New Animals Grades 5~6 STEAM

High school

Physics, Chemistry Paid content
Activity Name Applicable Grade Unit Name
Kinetic Energy Transfer High (1) Mechanics and Energy
Chain Reaction High (1) Mechanics and Energy
Runaway Truck High (1) Mechanics and Energy
Newton's Cradle Exploration Ancient (1) Mechanics and Energy
Exploration of Newton's Cradle Ancient (1) Mechanics and Energy
Conservation of Energy Ancient (1) Mechanics and Energy
Newton's Cradle - Analysis Ancient (1) Mechanics and Energy
Advanced Chain Reactions Ancient (1) Mechanics and Energy
Energy Ski Ball High School (1) Mechanics and Energy
Basketball Dribbling High School (1) Mechanics and Energy
Designing Solutions for Collisions High School 1st Year (3) Mechanical Systems
Lucky Shot High School 1st Year (3) Mechanical Systems
Energy, Momentum, and Impulse High School 1st Year (3) Mechanical Systems
Force and Motion 11th Grade (1) Mechanics and Energy
Maze Master 11th Grade (1) Mechanics and Energy
Newton's Third Law 11th Grade (1) Mechanics and Energy
Roller Coaster Design 11th Grade (1) Mechanics and Energy
Putting Green Challenge 11th Grade (1) Mechanics and Energy
Motion is on force and mass Dependence 11th Grade (1) Mechanics and Energy
Force, Momentum, and Collision 11th Grade (1) Mechanics and Energy
Conservation of Momentum 11th Grade (1) Mechanics and Energy
Accident Investigator 11th Grade (1) Mechanics and Energy
Launcher Fell 12th Grade (1) Mechanical Interaction
Parabolo Trajectory High School Senior (1) Mechanical Interaction
Target Exercise 1 High School Senior (1) Mechanical Interaction
Target Exercise 2 High School Senior (1) Mechanical Interaction
Skating Park High School Senior (1) Mechanical Interaction
Vector : Part 1 High School Senior (1) Mechanical Interaction
Vector : Part 2 High School Senior (1) Mechanical Interaction
Speeding Ticket High School Senior (1) Mechanical Interaction
Graph Motion High School Senior (1) Mechanical Interaction
Movement in Two Directions High School Senior (1) Mechanical Interaction
Motorcycle Stunt High School Senior (1) Mechanical Interaction
Pro Golfer High School Senior (1) Mechanical Interaction

Middle school

Physics, Chemistry Paid content
Activity Name Applicable Grade Unit Name
Balanced Forces and Unbalanced Forces Middle School 1st Year (2) Various Forces
Determining Motion Part 1 by the Sum of Forces Middle School 1st Year (2) Various Forces
Unbalanced Forces Playground Middle School 1st Year (2) Various Force
Delete Object Middle School 1 (2) Various Forces
Let's Bowl! Middle School 1 (2) Various Forces
Discovering Friction: Part 1 Middle School 1 (2) Various Forces
Discovering Friction: Part 2 Middle School 1 (2) Various Forces
Gravity Middle School 1 (2) Various Force
Evidence of Gravity Middle School 1 (2) Various Forces
Balanced Forces and Unbalanced Forces Middle School 1 (2) Various Forces
Determining Motion Part 1 by the Sum of Forces Middle School 1 (2) Various Forces
Unbalanced Force Playing Field Middle School 1 (2) Various Forces
Object Deletion Middle School 1 (2) Various Forces
Let's Bowl! Middle School 1st Year (2) Various Forces
Discovery of Friction: Part 1 Middle School 1st Year (2) Various Forces
Discovery of Friction: Part 2 Middle School 1st Year (2) Various Forces
Gravity Middle School 1st Year (2) Various Forces
Proof of Gravity Middle School 1st Year (2) Various Force
Games Around the Solar System Middle School 1st Year (2) Various Forces
Investigation of Gravity Middle School 1st Year (2) Various Forces
1 : Observation of Gravity Middle School 1st Year (2) Various Forces
2 : Investigation of Gravity Middle School 1st Year (2) Various Forces
3 : Observation of Unknown Gravity Middle School 1st Year (2) Various Force
4: Investigating Unknown Gravity Middle School 1 (2) Various Forces
5: Gravity Challenge Middle School 1 (2) Various Forces
Explosion! Middle School 3 (19) Kinetics and Energy
Graph of Speed ​​vs. Time Part 1 Middle School 3 (19) Kinetics and Energy
Graph of Speed ​​vs. Time Part 2 Middle School 3 (19) Kinetics and Energy
Graph Velocity vs. Time: Mass and Force (Graph Velocity vs. Time: Mass) Middle School 3 (19) Kinetics and Energy
Graph Velocity vs. Time: Gravity Middle School 3 (19) Kinetics and Energy

Elementary school

Physics, Chemistry Paid content
Activity name Applicable grade Unit Name
Properties of Materials 4th Grade (1) Properties of Matter
Relationship between Velocity, Energy, and Momentum 5th Grade (7) Motion of Objects
Effect of Collisions on Energy 5th Grade (7) Motion of Objects
Collision Process 5th Grade (7) Motion of Objects
Investigation: Conductivity 6th Grade (13) Use of Electricity
Investigation: Open and Closed 6th Grade (13) Use of Electricity
Assignment: Series and Parallel Circuits 6th Grade (13) Use of Electricity
Warm up and cool down the school 6th Grade (13) Use of Electricity
What is Energy? 6th Grade (17) Energy and Life
Energy, Speed ​​and Collision 6th Grade (17) Energy and Life
Energy Change 6th Grade (17) Energy and Life

High school

Physics, Chemistry Built-in content
Activity Name Applicable Grade Unit Name
P and S Waves High School (3) Waves and Information & Communication
(Collision) Collision on a Doll High School 1st Year (3) Mechanical Systems
How Does a Parachute Work? High School 2nd Year (3) Mechanical Systems

Middle school

Physics, Chemistry Built-in content
Activity Name Applicable Grade Unit Name
Solid, Liquid, or Gas Middle School 1st Year (5) Changes in the State of Matter
The Effect of Energy on the State of Matter Middle School 1st Year (5) Changes in the State of Matter

Elementary school

Physics, Chemistry Built-in content
Activity Name Applicable Grade Unit Name
What Did You Make? Grade 4 (1) Properties of Matter
Fun Time with the Sun Grade 5 (2) The Solar System and Stars
Why Do We Need Food? Grade 6 (17) Energy and Life

High school

Earth science Paid content
Activity Name Applicable Grade Unit Name
Exploring the Solar System: Phases of the Moon High School (6) Planetary Motion
Exploring Beach and River Erosion: The Power of Water High School 1st Year (2) History of the Earth
Exploring Rocks and Earth Changes: Topographical Features High School 1st Year (2) History of the Earth

Middle school

Earth science Paid content
Activity Name Applicable Grade Unit Name
Movement of Earth's Plates Middle School 1st Year (1) Changes in the Lithosphere
Rocks and the Changing Earth Middle School 1st Year (1) Changes in the Lithosphere
Solar System Exploration: Planetary Comparison Middle School 2nd Year (10) Solar System
Solar System Exploration: Phases of the Moon Middle School 2nd Year (10) Solar System
Global Water Distribution and Water Cycle Middle School 2nd Year (14) Hydrosphere and Ocean Circulation
Water Exploration: Human Influence Middle School 2nd Year (14) Hydrosphere and Ocean Circulation
Global Water Distribution Middle School 3rd Year (14) Hydrosphere and Ocean Circulation
Ocean, Land, and Wind Middle School 3rd Year (18) Withdrawal and Weather

Elementary school

Earth science Paid content
Activity Name Applicable Grade Unit Name
Weathering - Freezing and Thawing Grades 3~4 (4) Changes in the Earth's Surface
Water Exploration: Where is Water Found? Grades 3~4 (17) The Journey of Water
Introduction to the Solar System Grades 5~6 (2) The Solar System and Stars
Introduction to the Solar System: Patterns of the Sun, Moon, and Stars Grades 5~6 (9) Motion of the Earth and Moon

High school

Earth science Built-in content
Activity Name Applicable Grade Unit Name
Idea Sheet: Planets High School 1st Year (6) Planetary Motion
Collection: Planets High School 2nd Year (5) Stars and Exoplanetary Systems

Middle school

Earth science Built-in content
Activity Name Applicable Grade Unit Name
Rock Cycle Middle School 1st Year (1) Changes in the Lithosphere
Learning History of Rock Layers Middle School 1st Year (1) Changes in the Lithosphere
Cave Middle School 1st Year (1) Changes in the Lithosphere
Seafloor Spread Middle School 1st Year (1) Changes in the Lithosphere
Types of Volcanoes Middle School 1st Year (1) Changes in the Lithosphere
Continental Drift Middle School 1st Year (1) Changes in the Lithosphere
Space Life and Research Middle School 1st Year (2) Various Forces
Orbit Middle School 1st Year (2) Various Forces
Micro Mercury Middle School 2nd Year (10) Solar System
Geocentric vs. Heliocentric Solar System Middle School 2nd Year (10) Solar System
Comparison of Objects in the Solar System (Solar System) Middle School 2nd Year (10) Solar System
Patterns of the Sun, Earth, and Moon (Solar Exploration) Middle School 2nd Year (10) Solar System
Lunar Calendar and Solar Eclipse Middle School 2nd Year (10) Solar System
Moving by Flow Middle School 2 (14) Hydrosphere and Ocean Circulation
Collection: Planets Middle School 3 (23) Stars and Space

Elementary school

Earth science Built-in content
Activity Name Applicable Grade Unit Name
Arctic Animals That Change the Environment (Arctic: Sea Ice Predators) Grades 3~4 (3) Animal Life
Weathering Grades 3~4 (4) Changes in the Earth's Surface
All About Fossils Grades 3~4 (6) Strata and Fossils
A Day's Volcanologist Grades 3~4 (11) Volcanoes and Earthquake
Plate Boundaries Grades 3-4 (11) Volcanoes and Earthquakes
Layers of the Earth Grades 3-4 (16) Appearance of the Earth
Layers of the Earth's Atmosphere Grades 3-4 (16) Appearance of the Earth
Earth's Ozone Layer Grades 3-4 (16) Appearance of the Earth
Moon Exploration Grades 3-4 (16) The Appearance of Earth
Water Cycle (Clouds) 3rd~4th Grade (17) The Journey of Water
Skating or Swimming 3rd~4th Grade (18) The Journey of Water
Super Solar System 5th~6th Grade (2) The Solar System and Stars
Visible Venus 5th~6th Grade (2) The Solar System and Stars
A Special Earth 5th~6th Grade (2) The Solar System and Stars
Amazing Mars 5th~6th Grade (2) The Solar System and Stars
Jumbo Jupiter 5th~6th Grade (2) The Solar System and Stars
Cool Saturn 5th~6th Grade (2) The Solar System and Stars
Unique Uranus 5th~6th Grade (2) The Solar System and Stars
Notable Neptune 5th~6th Grade (2) The Solar System and Stars
Star vs. Sun Brightness 5th~6th Grade (2) The Solar System and Stars
Constellation Exploration 5th~6th Grade (2) The Solar System and Stars
Collect: Planets 5th~6th Grade (2) The Solar System and Stars
Reduction, Reuse, and Recycle 5th~6th Grade (5) Biology and Environment
What is the weather today? (How is your weather?) 5th~6th Grade (6) Weather and Our Lives
Clouds and Weather Patterns (Clouds, Clouds, and Other Clouds) 5th~6th Grade (6) Weather and Our Lives
I Like Home 5th~6th Grade (6) Living Things and the Environment
Idea Sheet: Moon 5th~6th Grade (9) Movement of the Earth and the Moon
How is the weather this season? 5th~6th Grade (14) Changes in Seasons
Weather and Climate (Does it snow in summer?) 5th~6th Grade (14) Changes in Seasons
Earth's Movement in the Solar System (Seasons) 5th~6th Grade (14) Changes in Seasons
Collection : Weather 5th~6th Grade (14) Changes in Seasons
How to Launch a Rocket 5th~6th Grade (17) Energy and Lifestyle

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