A few precautions can help most climbers avoid altitude sickness.
出自-2012年12月聽力原文
柯林斯高階英漢雙解學習詞典釋義
N-COUNT
預防措施；防備
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?...就算僅僅是為了以防萬一，難道他就不能挪到安全的地方嗎？I had taken the precaution of doing a little research before I left London...我已在離開倫敦前進行了準備，做了些調查研究。