중등 지문
과학
Gravity is an invisible force that pulls everything toward the center of the Earth. Without this force, we would float away into space instead of walking on the ground. Everything in the universe has its own gravity, but larger objects have a much stronger pull. This is why the Earth keeps us on the ground and also keeps the moon in orbit. Gravity is essential because it holds our world together every single day.
핵심 표현
- invisible
- 보이지 않는
- orbit
- 궤도(를 돌다)
- essential
- 필수적인
이해도 확인
What happens because of the Earth's gravity?