engine preheater

例句：

1. 1.The engineer preheated the engine before starting it.
   工程师在启动之前预热了引擎。
2. 2. The preheater is designed to warm up the engine before it starts.
   预热器设计用来在引擎启动前加热它。
3. 3. The preheater was a critical component in ensuring the engine's smooth operation.
   预热器是确保引擎顺畅运行的关键部件。