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预防措施；防备
A precaution is an action that is intended to prevent something dangerous or unpleasant from happening.
例句
Could he not, just as a precaution, move to a place of safety?...
就算仅仅是为了以防万一，难道他就不能挪到安全的地方吗？
I had taken the precaution of doing a little research before I left London...
我已在离开伦敦前进行了准备，做了些调查研究。