swing part

例句：

1. 1.The car's engine is a complex system that requires regular maintenance.
   汽车的发动机是一个复杂的系统，需要定期维护。
2. 2.The swinging door creaked as it opened.
   摇动的门在打开时吱吱作响。
3. 3. The engineer carefully inspected the swinging parts of the machine to ensure they were functioning properly.
   工程师仔细检查了机器的摇摆部分，确保它们正常工作。