knobs
n.
小块( knob的名词复数 );
（收音机等的）旋钮;
（门、抽屉的）球形把手;
疙瘩;
例句:
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I was confronted with an array of knobs, levers, and switches.
我面对的是一大堆旋钮、控制杆和开关。
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All their beds were distinctive; Mac'swas an iron affair with brass knobs.
他们的床都各具特色；马克的床是张带球形黄铜柱头的铁家伙。
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But bathroom light switches and door knobs did not.
来自WSJ
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The door knobs came off in our hands.
我们用手一扭，门把手就掉了下来。
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Remember the knobs on the top of the maple bedposts?
来自P. Roth
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Rows of knobs, dials with needles all set at zero.
来自J. Hawkes