knob [nɒb]

以下由轻松背单词网站提供

n.球形把手，球形柄，旋钮，小块

a round handle , or a small round device for controlling a machine or electrical equipment

There is a knob of butter on the table. 桌子上有一小块黄油。
This knob is only held on by sellotape. 这个旋钮只是用透明胶带固定住的。