alveolar theory

例句：

1. 1. The alveolar theory is widely accepted in the field of respiratory physiology.
   肺泡理论在呼吸生理学领域被广泛接受。
2. 2. The alveolar theory has been challenged by recent studies showing that airflow is not uniform across the lungs.
   最近的研究表明，空气流动并不是均匀分布在肺部的，这挑战了肺泡理论。
3. 3. The alveolar theory suggests that the alveoli are small, air-filled sacs thatplay a crucial role in gas exchange.
   肺泡理论认为，肺泡是微小的空气囊，它们在气体交换中起着至关重要的作用。