以上来源于: WordNet
Is that causes by gravitational attraction?
这是由万有引力作用产生的吗?
So, he was able to explain this using his laws for gravitational attraction.
他根据自己提出的万有引力定律,解释这一定律。
And we have also seen gravitational attraction in space, and I will let you look at your notes for that.
我们还学习过空间中的万有引力,关于这个知识点,大家翻一翻笔记。
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