jig key

例句：

1. 1. The car's steering wheel is connected to the gearbox with a jig key.
   汽车的方向盘通过一个曲柄键与变速箱相连。
2. 2.The engineer used a jig key to adjust the bolts on the machine.
   工程师用曲柄键调整机器上的螺栓。
3. 3.The jig key was essential for the operation of the machine.
   曲柄键对于机器的操作至关重要。