旋钮

He slowly turned the dial to change the frequency.

他慢慢转动钮来改变频率。

This knob is only held on by sellotape.

这个钮只是用透明胶带固。

This machine has lots of knobs on it. Which one starts it?

这机器有许多钮。哪一个是启动它？

Turning the knob fully counterclockwise (to OFF) allows the gate to pass signals unattenuated, effectively bypassing the gate.

逆时针转钮到OFF,这样，允许信号毫无衰减通过，有通。

My radio's knob got loose.

我收音机上钮松动了。