the provision of fresh air to a room, building, etc.
通风;换气。
【医】 (尤指人工)给肺提供空气。
public discussion or examination of an opinion, issue, complaint, etc.
(对意见、问题、抱怨等的)公开讨论(或调查)。
"late Middle English (in the sense ‘current of air’): from Old French, or from Latin