Think of it as a volume knob, for example, that can't be turned any further.
例如我们可以认为它是一个音量调节旋钮，现在它已经无法再进行调节了。
Saying "Baby" over and over again, Ace backed up to the radio and, without turning around, switched on the volume knob.
埃斯口中不停地叫着“宝贝”，他退到收音机前，没有转身就打开了音量的旋钮。
This knob controls the volume.
此旋钮调节音量。
Turning the knob of a radio one can fade the volume of sound in or out.
旋转收音机的旋钮，你就能使音量渐渐增大或减弱。
Turning the knob of a radio one can fade the volume of sound in or out.
旋转收音机的旋钮，你就能使音量渐渐增大或减弱。
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