是肺的含气部分，包括呼吸细支气管，但不包括单纯的传导性气道，如终末细支气管。
Anatomy. — An airspace is the gas-containing part of the lung, including the respiratory bronchioles but excluding purely conducting airways, such as terminal bronchioles.
发生全肺气肿时，从呼吸性细支气管到肺泡的所有腺泡都丢失了。
Panacinar emphysema occurs with loss of all portions of the acinus from the respiratory bronchiole to the alveoli.
现在是呼吸性疾病的季节，细支气管炎的患儿数量增加。
Now that respiratory season is upon us, we are faced with an increasing number of bronchiolitis children.
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