n.1. 小心,警惕,謹防,預防
2. 預防措施
v.1. 使提防;預先警告
例句：
1、It was the first time that such a precaution had to be taken at a British nuclear power station.
這是有史以來第壹次壹個英國核電廠采取這樣的預防措施。
2、Despite precaution,20 minutes after beginning to traverse the bottom, the huge sled smashed into the rocky sea floor.
盡管采取了壹些預防措施，但是在橫越海底20分鐘以後，那個巨大的橇狀裝置還是撞進了多巖石的海底。
3、He took every precaution but still got a bad deal on that used car.
他處處小心但還是在舊車交易中受騙。
4、They were old,but still politically active, and it seemed to measensible precaution.
他們都老了，但在政治上仍很活躍，因此在我看來，這是明智的預防措施。