operating lever spring foot

例句：

1. 1. The engineer operated thelever to adjust the speed of the machine.
   工程师操作操纵杆来调整机器的速度。
2. 2.The operator had to operate the lever toopen the door.
   操作员必须操作操纵杆才能打开门。
3. 3. The technician was instructedto operate the lever to check the safetymechanism.
   技术员被指示操作操纵杆来检查安全机制。