gear grease

例句：

1. 1. The engine needs a new gear grease to keep it running smoothly.
   发动机需要新的齿轮润滑油来保持顺畅运行。
2. 2.The mechanic replaced the old gear grease with fresh one.
   机械师用新鲜的齿轮润滑油替换了旧的。
3. 3.The car's gear grease is leaking, which could cause serious damage to the engine.
   汽车的齿轮润滑油正在泄漏，这可能会严重损坏引擎。