If you fall 3 meters, the earth is pulled you down 3 meters, but you have also exerted an equal and opposite force on the earth.
如果你下降3米，就是说地球把你向下拉3米，但你也对地球施加了一个大小相等，方向相反的力。
If you fall 3 meters, the earth is pulled you down 3 meters, but you have also exerted an equal and opposite force on the earth.
如果你下降3米，就是说地球把你向下拉3米，但你也对地球施加了一个大小相等，方向相反的力。
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