air passage

名词 air passage:

1. a duct that provides ventilation (as in mines)
   同义词：air duct, airway

1. A constricted throat in the air passage of a carburetor, causing a reduction in pressure that results in fuel vapor being drawn out of the carburetor bowl.
   文丘里管汽化器空气通道中的一段喉管，导致压力减小从而把燃料的蒸气抽出汽化器的碗状部分