内燃机发出轰鸣声, 列车员跳上车厢, 火车开走了.The diesels roared, the conductors jumped aboard, and off the train went.工程师在设法制造一种在商业上切实可行的发动机来取代内燃机.Engineers are still trying to come up with a commercially viable replacement for internal - c...
The students were all waiting expectantly with grins on their faces.学生都含笑期待着.He grins, delighted at the memory.想到往事，他开心地咧嘴笑了起来。The very few who knew exchanged celestial grins.了解内幕的很少几个人只好招以会心的微笑....