huó​mén​r

valve

活门儿 活門兒 huó​mén​r
valve
valve; movable part that controls the flow of liquid or gas
way out
a way out of a difficult situation; a means of survival
servant trade connection
(archaic) a continuing relationship between the buyer and seller of a maidservant or concubine after the transaction is completed
latch; bolt
movable door bolt or latch mechanism