concealed wiring

隐蔽布线，暗线

1. 隐蔽电线：concealed piping 隐蔽喉管 | concealed wiring 隐蔽电线 | concentrated load 集中载重;集中荷载

2. 隐藏式路由：concave mirror 凹镜 | concealed wiring 隐藏式路由 | concentration cell 浓差电池

3. 隐蔽布线：concealed mounting 隐蔽安装 | concealed wiring 隐蔽布线 | concentrate 浓缩物;集中

4. 暗线：concealed sprinkler 隐藏型洒水喷头 | concealed wiring 暗线 | concentrate foam liquid 泡沫液