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RicharGross

RicharGross

RicharGross

RicharGross

1

Richard Gross: This is just like an ice skater , a spinning ice skater who will spin faster as she brings her arms closer to her body .

RicharGross ：这就像一个溜冰者，当她旋转时，手臂越靠近身体，就转得越快。

2

Richard Gross: The Earth's rotation changes all the time .

RicharGross ：地球的自转一直在改变。

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