crown of piston

例句：

1. 1. The engine's crown ofpiston is where the piston movesup and down.
   发动机的活塞顶部是活塞上下移动的地方。
2. 2. The engineer carefully inspectedthe crown of piston to ensure itwas functioning properly.
   工程师仔细检查了活塞顶部，确保它正常工作。
3. 3. During the test, the technician observed the crown of piston closely to detect any signs of wearor damage.
   在测试期间，技术员密切观察活塞顶部，以检测任何磨损或损坏的迹象。