介绍:
I'm in the middle of...我正忙着....
I was in the middle of making a pie for dinner when the telephone rang.
我正忙着做正餐吃的馅饼，这时电话响了。
They were in the middle of a party when the parents came back suddenly.
父母突然返回时，他们正在开晚会。
大家还在听
