This aircraft works by jet propulsion.
这架飞机是喷气推进的。
Developing the supersonic jet was quite an accomplishment.
开发超音速喷气机是一项了不起的成就。
An ordinary subway train, approaching the station, can be twice as loud as the loudest jet.
平常的地下火车接近车站时，发出的声音可能是最大声的喷射机的两倍。
