在岗, 警惕

on guard的用法和样例：

例句

He reported the murder to the police on duty.他将凶杀事件告知值班警察。
There was no fireman on when the fire broke out.火灾发生时没有消防队员在值班。
Keep a vigilant eye on the imperialist jackals.对帝国主义的走狗要保持警戒。
Put none but Americans on guard tonight.今夜只让美国人担任警戒。

词汇搭配

on guard值班
be on one's guard戒备着
put someone on guard劝某人警惕,让某人提...
on one's guard警惕
put someone on his guard劝某人警惕,让某人提...
lie on one's guard提防
stand on one's guard警戒

【近义词】

cautious谨慎的
circumspect细心的
on your guard警戒(警惕
on one's guard警惕

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