单词：air exchange
air exchange的用法和样例：
例句
- One can see why gas exchange is severely compromised.这就是气体交换严重障碍的原因。
- Ground water also contains dissolved carbon dioxide from the air and from the exchange of gases in plant roots.地下水也含有溶解了的二氧化碳，这些二氧化碳是从空气和从植物根系的气体交换中获得的。
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