火车头

例句：

1. 1.The train's engine is the most important part of the locomotive.
   火车的引擎是机车最重要的部分。
2. 2. The locomotive head is responsible for guiding the train's movement.
   机车头负责指导火车的运动。
3. 3. The engineer needs to inspect the locomotive head regularly to ensure safety.
   工程师需要定期检查机车头以确保安全。