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1. allergic to 对|……过敏
Oh man! Something in this room is making my eyes itch, I must be allergic to something.
2. at sb’s service 愿为某人服务
I am at your service at any time.
3. around the clock 24小时不停
Martha studied around the clock for management exam.
4. as far as I know 就我所知
5.at home with 对…..很熟悉
She is at home with problems like this.
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