engine gum

例句：

1. 1.The train's engine roared to life.
   火车的引擎轰鸣着启动了。
2. 2.The car's engine is loud and noisy.
   这辆车的引擎声音很大。
3. 3.The engineer was responsible for the safety of the aircraft.
   这位工程师负责飞机的安全。