As the water is pumped out, the vacant space left is compacted by the weight of the earth above.

当水被抽出来时，剩余的空间被上层的泥土填满压实。

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That's the weight of 15,000 blue whales, the largest animal on Earth.

那相当于一万五千头蓝鲸的重量，而蓝鲸是地球上最大的动物。

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This could not be otherwise; and from the slowness of a vibration, or from the small number of vibrations in a day, Cavendish computed the real weight of the earth.

就是用这样的办法，通过观察这缓慢的振动和计算一天中的振动次数，卡文迪什计算出了地球的确切的重量。

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Cmdr Hadfield added that upon his return to Earth he noticed the weight of his tongue and lips and was remembering how to speak under the force of gravity, while his neck and back felt sore from having to support his head again.

BBC: Chris Hadfield: 'Space was too good not to share it'

The Discovery astronauts are adjusting to life back on Earth and a few hundred extra pounds of body weight after a landing this morning.

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