synchronizing knob

例句：

1. 1. The engineer adjusted the synchronizing knob to ensure smooth operation of the machine.
   工程师调整了同步调节旋钮，以确保机器的平稳运行。
2. 2. The technician replaced the synchronizing knob with a new one, fixing the issue immediately.
   技师用一个新的同步调节旋钮替换了旧的，立即解决了问题。
3. 3.The car's synchronizing knob was loose and causing the engine to misfire.
   汽车的同步调节旋钮松动，导致发动机点火不准确。