Eventually the respiratory bronchioles ends when there are nothing but alveoli, and at that point the airway is called an alveolar duct rather than a respiratory bronchiole.

最终呼吸性细支气管结束于肺泡，此时气道被称为肺泡管，而不是呼吸性细支气管。

The respiratory zone includes the respiratory bronchioles and the alveoli.

呼吸区包括呼吸性细支气管和肺泡。

The respiratory zone includes the respiratory bronchioles and alveoli and moves the respiratory gases, that is oxygen and carbon dioxide, in and out of the blood.

呼气区包括呼吸性细支气管和肺泡，它们运送氧气和二氧化碳这些参与呼吸的气体进出血液。