来自propel,推进，推动，-s,过去分词后缀。

1. The nineteenth century witnessed a revolution in ship design and propulsion.

19世纪船舶设计和船舶动力领域发生了重大的变革。

2. Interest in jet propulsion was now growing at the Air Ministry.

航空部对喷气推进的兴趣正在增加。

3. The liquids employed for rocket propulsion are called propergols.

用于火箭发动机的液体称为液体火箭推进剂.

4. The propulsion system consists of five F - 1 engines.

推进系统包括五个F -1 发动机.

5. The essential quality that dictates the choice of this propulsion system is readiness.

决定选用这种推进系统的主要因素就是其简便性.