n. 球形把手；旋钮
a knob of sth 一小块某物 ≈ lump
the volume control knob 音量控制旋钮
He thought the door was locked, but he turned the knob and the door opened. 他本以为门是锁住的，但是转了一下把手门就开了。
I adjusted the volume knob and sat down. 我调节好音量旋钮，坐了下来。
BrE /əˌbriːviˈeɪʃn/