I'm in the middle of... 我正忙着……
这里的"in the middle of..."表示正在做某事的过程中。
1. I'm just in the middle of coordinating the press conference.
2. I was in the middle of making a pie for dinner when the telephone rang.
3. They were in the middle of a party when the parents came back suddenly.
A: Marry, Mr Johnson wants these documents to be copied.
B: Oh, no. You see I'm in the middle of something. Could he wait?
A: I'm afraid...
B: All right, all right. He'll get them as soon as possible.