air passage是什么意思 air passage怎么读
air passage的英文翻译是什么意思，词典释义与在线翻译
Noun:- a duct that provides ventilation (as in mines)
air passage的用法和样例
- Propeller fans are used to move free air within a room or through channels having low frictional resistance.
螺旋桨式风机通常用于房间内或通过风道时移动自由气流时，产生微弱的摩擦阻力。
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