n.预防，防备，警惕；预防措施；避孕措施；vt.使提防；预先警告； 变形： 复数：precautions 双语释义：n.(名词)[C]预防措施 an action done to avoid possible danger, discomfort, etc.英英释义： precaution[ pri'kɔ:ʃən ]n.a precautionary measure warding off impending danger or damage or injury etc."he put an ice pa