1)air hole,换气窗2)vent,换气窗3)change breath,换气4)air change,换气5)air exchange,换气6)exchange of air,换气7)scavenge,换气8)ventilation,换气9)renewal of air,换气10)change of air,换气
用法例句
It puts forward that inverted breaststroke and inverted crawl in synchronization may help beginners to master the way of change breath very conveniently.
