door-knob门把
door-knob capacitor[电] 门钮形电容器
door-knob tube钮形管
door lock knob车门止锁按钮;门锁旋钮
door-knob transformer[通信] 门钮形转换器
door cylinder Knob锁芯把手
door-knob b门把
door-knob transition门钮形变换
door lock with knob球型门锁
N-COUNT(可数名词) A doorknob is a round handle on a door. 门环