1、严防
...jiè bèi to take precautions; to guard against (emergency) 严防 严防yán fáng to take strict precautions; on your guard 便衣警察 便衣警察biàn yī jǐng chá plain-clothed policeman ..
2、警戒
... 1.irritability n. 易怒，过敏性，兴奋性 2.on your guard adj. 警戒(警惕，提防) 3.carp at v. 挑剔 ...