precautionn.预防;预防措施
precaution signal注意信号
precaution against预防 ...; 警惕
precaution project应急预案
precaution measure防范措施
Precautionary area警戒区
precautionary error预防错误
precautionary range预先警告范围
precaution solution防范对策
precautionary store预防性储蓄
precaution analysis预警分析