to be engaged in doing,to work at,to be occupied in doing忙于……【例解】 1. It was late on the night of October 20,1939,when Dr.Bethune was busy working in a field hospital. 1939年10月20日深夜,白求恩大夫正在一所野戰(zhàn)醫(yī)院忙著工作。2. He was busy getting ready for his jou......（本文共 939 字）     [閱讀本文] >>