cylinder block oil hole

例句：

1. 1.The engine needs to be cleaned regularly to keep it running smoothly.
   发动机需要定期清理以保持顺畅运行。
2. 2. The cylinder block is the main component of the engine.
   气缸体是发动机的主要部件。
3. 3. The oil hole in the cylinder block helps lubricate the moving parts of the engine.
   气缸体中的油孔有助于润滑发动机的移动部件。