knob n.把手,瘤,旋钮,球形突出物...end-knob 尾结...knob operated control 按钮式控制...calibrating knob 校准钮...knob insulator 捻头绝缘器...operating knob 操作钮...aortic knob 主动脉球,主动脉结...trophoblastic knob 滋养层结...embryonic knob 胚结...
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