They store the energy mechanically by rotating mass around an axis.
它们通过质量绕轴旋转机械存储能量。
An earthquake can make earth rotate faster by nudging some of its mass closer to the planet's axis, just as ice skaters can speed up their spins by pulling in their arms.
一次地震可以使地球旋转得更快，通过将地球的质量向它的轴线轻推，正如滑冰的人可以通过缩回他们的手臂来使旋转加速。
Since that pulls mass closer to the planet's spin axis, it causes the planet to rotate faster - just as an ice skater spins faster when she pulls her arms towards her body.
由于质量朝地球旋转轴靠拢，这就导致地球旋转速度加快- - -就像一个速度滑冰选手，当她把胳膊向身体收拢时就会旋转得更快。
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