遇到紧急情况发动机便自动停止工作。

The engines shut off automatically in an emergency.

《牛津词典》

超高速冲压喷气发动机引擎在飞机超过音速的情况下不能启动。

Scramjets engines can not start until the plane flies faster than the speed of sound.

youdao

在全电模式下，通用公司的这款汽车预计行可行驶50英里(合80公里)，足以满足大多数美国通勤者的需求，这样他们只在跑长途的情况下才需要使用汽油发动机。

GM's car is expected to go around 50 miles (80km) in all-electric mode, more than enough for most American commuters, who would need to use the petrol engine on longer trips only.

youdao

And of course even if in many cases, the engine continues to exist for a while, after the destruction of the car, certainly it doesn't follow the engine is immortal that continues to exist forever.

当然，即使在许多情况下，发动机在汽车毁坏后，能继续存在一段时间，但当然不能得出结论说,发动机是不朽的会永远存在下去。

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