英汉词典

1. （门或抽屉的）球形把手
    A knob is a round handle on a door or drawer which you use in order to open or close it.

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    e.g. He turned the knob and pushed against the door.
           他扭动把手推了推门。

2. （柱子或棍子顶部的）疙瘩，节，球状物
    A knob is a rounded lump or ball on top of a post or stick.

    e.g. A loose brass knob on the bedstead rattled.
           床架上一个松动的球形铜扣发出嘎啦声。

3. （机器或设备的）旋钮
    A knob is a round switch on a piece of machinery or equipment.

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    e.g. ...the volume knob.
           音量旋钮

4. 小块（黄油）
    A knob of butter is a small amount of it.

    e.g. Top the steaming hot potatoes with a knob of butter.
           在冒热气的马铃薯上放一小块黄油。