alveolar air

例句：

1. 1.The lungs are responsible for the exchange of alveolar air.
   肺部负责交换肺泡空气。
2. 2.During sleep, the alveolar air is reabsorbed into the bloodstream.
   在睡眠期间，肺泡空气被重新吸收到血液中。
3. 3.Alveolar air plays a crucial role in maintaining the body's oxygen levels.
   肺泡空气在维持身体氧气水平方面起着至关重要的作用。