評(píng)論
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Gravity
重力
What happens if you drop a book?
如果你丟一本書會(huì)發(fā)生什么？
Absolutely, it will fall down to the floor. This is called gravity.
很顯然，書會(huì)掉到地上。這就叫做重力。
Gravity pulls from the center of the Earth.
地心引力來自于地球中心。
So things fall down to the ground because of gravity.
所以，物體落在地面上都是因?yàn)橹亓Α?/div>
Do you know what would happen without gravity?
你知道沒有重力會(huì)怎么樣嗎？
Everything would float around in the air.
所有物體都會(huì)漂浮在空中。
When you fly high away from the Earth into space, you will float around.
當(dāng)你飛離地球到太空時(shí)，你就會(huì)漂浮起來。
