严防
警戒
警惕

on your guard的用法和样例：

例句

Be on your guard against Miss Thompson. She's an old cat.你要当心汤普森小姐，她是个脾气很坏的老太婆。
Be on your guard, I conjure you.千万要警惕呀，我恳求你。

【近义词】

on guard值班
on one's guard警惕

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英语新闻

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英语新闻

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