rotor exterior ring

例句：

1. 1.The new design of the aircraft's rotor exterior ring has significantly improved its performance.
   飞机的新设计的转子外圈已经显著提高了其性能。
2. 2. The engineer carefully inspected the rotor exterior ring before installing it on the machine.
   工程师在安装机器之前仔细检查了转子外圈。
3. 3. The rotor exterior ring is a critical component that must be maintained to ensure safe operation of the aircraft.
   转子外圈是一个重要的组件，必须保持良好状态以确保飞机的安全运行。