grease groove

例句：

1. 1. The car's engine has a grease groove that needs to be cleaned regularly.
   这辆车的引擎有一个需要定期清理的油槽。
2. 2.The old machine had several grease grooves that needed to be repaired.
   那台旧机器有几个需要修理的油槽。
3. 3.The engineer carefully inspected the grease grooves on the gearbox to ensure they were properly lubricated.
   工程师仔细检查了齿轮箱上的油槽，以确保它们得到了适当的润滑。