normal mode of vibration

例句：

1. 1. The machine operates normally when itis turned on.
   机器开启时运行正常。
2. 2.The team's performance was in thenormal mode of operation.
   团队的表现处于正常操作模式。
3. 3. The aircraft landed safely in thenormal mode of flight.
   飞机以正常飞行模式安全着陆。