“罩”某人：watch one's back.
John told me he would watch my back in the math exam.
约翰对我说，数学考试他会罩我。
I'll watch your back at this end. You can count on me.
在我这头，我会罩你。你可以信赖我。
注意：watch one's back 有兩个截然不同的意思：若表示“罩”，主语和 one's必须是不同的人；如果主语和 one's 为同一人，那么意思便是“提防 (周围的人)”。如：
I have to watch my back at work – there are a lot of people who would like my job.
在工作上我必须提防周围的人——有许多人觊觎我的工作。
Life's too short to have to watch your back all the time.
人生苦短，不必一直提防別人。
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