防毒通道

protective passageway

to protect / to defend / to guard against / to prevent

defense against poison / defense against poison gas / anti-narcotics measures / defense against computer viruses

poison / to poison / poisonous / malicious / cruel / fierce / narcotics

to go through / to know well / (suffix) expert / to connect / to communicate / open / to clear / classifier for letters, telegrams, phone calls etc

classifier for an activity, taken in its entirety (tirade of abuse, stint of music playing, bout of drinking etc)

Tongdao Dong autonomous county in Huaihua 懷化|怀化[Huai2 hua4], Hunan

(communications) channel / thoroughfare / passage

road / path / CL:條|条[tiao2],股[gu3] / principle / truth / morality / reason / skill / method / Dao (of Daoism) / to say / to speak / to talk / classifier for long thin things (rivers, cracks etc), barriers (walls, doors etc), questions (in an exam etc), commands, courses in a meal, steps in a process / (old) circuit (administrative division)