gear box oil

例句：

1. 1. The mechanics need to change the gearbox oil regularly to keep the engine running smoothly.
   机械师需要定期更换齿轮箱油，以保证发动机平稳运行。
2. 2.The car's engine is prone to overheating if not properly maintained. It's important to check the gearbox oil level regularly.
   如果汽车的发动机没有得到适当的维护，很容易过热。定期检查齿轮箱油位是很重要的。
3. 3. The old truck has a lot of wear and tear on its gearbox, so it needs to be serviced frequently.
   旧卡车的齿轮箱磨损严重，因此需要经常进行保养。