be wary of

当心(提防)

例句与用法：

She was wary of strangers.

她对陌生人很警惕。

I would advise you to be wary of Kevin; he's been gunning for you since you stole his girlfriend.

我想劝告你提防克文，自从你抢走了他的女朋友以来，他一直在寻找机会报复你。