plunger joint rod

例句：

1. 1.The car's engine is running smoothly because the piston rod is in good condition.
   汽车的发动机运行平稳，因为活塞杆状况良好。
2. 2. The engineer inspected the piston rod to ensure it was not damaged during the accident.
   工程师检查了活塞杆，以确保在事故中没有受损。
3. 3. The technician replaced the piston rod with a new one after cleaning the cylinder.
   技师在清洗气缸后用一个新的活塞杆替换了旧的。