conducting door-to-door visits
door- to-door transport
door-to-door canvassing for sale
door-to-door rent collection system
pulse width modulate digital pulse width modulation tech-nique
“Chinese door knob”plum and peach cake
A pair of flexible leg door shelfs
a sign hung above a door
access door
检修门
人孔
检查门
通道门
便门
入孔盖
人孔门
进手门
口盖
出入门
检视门
进入门
出入门检修门
进出门
additional factor for exterior door