This knob is only held on by sellotape.

这旋钮只用透明胶带固定住的。

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

这器有多旋钮。哪一动它的？

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

逆时针旋转旋钮直到OFF,这样，允信号毫无衰减地通过，有效地直通。

My radio's knob got loose.

我上的旋钮松动了。