in the middle of: Literally, physically located at the center of something or some place. Or in a position between two or more sides in an argument or contentious issue, often leaving one without a clear course of action to satisfy either side. In a difficult situation:caught in the middle of a controversy. Engaged in doing something: I’m in the middle of making dinner.
中文释义：in the middle of是指在某个物体内部的中间，指的是物体内部，这里的物体可以是具体的，也可以是抽象的，比如说在教室中间，在一颗苹果中间，在一段旅程中间等等；通常还表示正忙于，正在做某事的过程中。例如：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。)