piston curl

例句：

1. 1. The car'sengine is running smoothly because the pistons are in good condition.
   汽车的发动机运行平稳，因为活塞状况良好。
2. 2. The engineerused a special tool to remove the piston curl from the cylinder.
   工程师使用特殊的工具从气缸中取出活塞曲柄。
3. 3. Thepiston curl is essential for the properfunctioning of the engine.
   活塞曲柄对于发动机的正常运作至关重要。