piston pin hole cap

例句：

1. 1.The piston pin cap is essential forensuring the proper functioning of the engine.
   活塞销孔盖对于确保发动机正常工作至关重要。
2. 2.The piston pin cap was designed toprevent oil from leaking out of thecylinder.
   活塞销孔盖的设计是为了防止机油从气缸中泄漏。
3. 3. The piston pin cap was replacedafter it failed to hold thepiston in place.
   活塞销孔盖在无法保持活塞位置后被更换了。