In 1939 the turbojet brought an entirely new method of propulsion.
1939年，涡喷发动机引入了一种全新的推力方法。
A vehicle propulsion system and a method of its operation are described.
描述了车辆推进系统和操作该车辆推进系统的方法。
The technical analysis and appreciative method of the electrical propulsion system;
本文列出了某船电力推进系统的几个投标方案。
The technical analysis and appreciative method of the electrical propulsion system;
本文列出了某船电力推进系统的几个投标方案。
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