In this engine, air is converted, by burning fuel, into a blast of hot gas moving at high velocity.
在这种发动机中，空气通过燃烧燃料转换成高速运动的一阵热的气体。
2
The jet leaves contrails in its wake due to the temperature difference between the hotengine exhaust and the cold air.
这架喷气式飞机飞行时留下的凝结尾是由于其发动机与冷空气之间的温差造成的。
3
When a jet engine is running, a fan at the front draws in air, which is then compressed and burned with fuel to produce hot, rapidly expanding gases which roar out of the back.