The idea of rogue planets wandering the galaxy is not as far-fetched as it may sound. Gravitational tugs-of-war with other planets or passing stars can boot a planet out of its solar system.

流浪行星在星系中游走这个概念并没有它听起来那么难以捉摸，与其他星球或流星的引力之战很有可能使该星球脱离太阳系。

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Their job is to prevent policies being pulled out of shape by inter- departmental tugs-of-war, or problems disappearing between the cracks at departmental boundaries.

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There were violent sporting contests, from tugs-of-war to free-form football matches.

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