通风口

air vent / opening for ventilation

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)

airy / ventilation / to ventilate / to disclose information

wind / news / style / custom / manner / CL:陣|阵[zhen4],絲|丝[si1]

air vent / drafty place / wind gap (geology) / tuyere (furnace air nozzle) / (fig.) hot trend / fad

mouth / classifier for things with mouths (people, domestic animals, cannons, wells etc) / classifier for bites or mouthfuls