piston pin

例句：

1. 1. The engine needs a new pistonpin to keep it running smoothly.
   发动机需要一个新的活塞销来保持其平稳运行。
2. 2. Themechanic replaced the piston pin with anew one.
   机械师用一个新的活塞销替换了它。
3. 3. The piston pin is essentialfor ensuring the smooth operation of the engine.
   活塞销对于确保发动机的平稳运行至关重要。