肺由称为肺泡的小气囊组成，当健康的人呼吸时会充满空气。
The lungs are made up of small sacs called alveoli, which fill with air when a healthy person breathes.
相反地，鸟类有一个复杂的肺泡结构，就像一个风箱把源源不断的空气打进肺里。
Instead, birds have a complex network of air sacs that work like bellows to pump a constant stream of air through the lungs.
肺泡是空气相互交换的地方。
对于哺乳动物，每次吸气都将富氧空气带进肺中被称为肺泡的“死胡同”。这些在肺泡中循环的空气通过与肺毛细血管的血液进行气体交换，输进氧气并带走血液中的二氧化碳。
Air circulating through these sacs transfers oxygen into the bloodstream that picks up the blood's carbon dioxide waste.
肺泡里的空气给血液供氧，同时接收血液里的二氧化碳。
Air inside an alveolus gives oxygen to blood and receives carbon dioxide from blood.
细支气管-- 支气管的细小分支，输送空气进出肺泡。
Small branch of the bronchus that carries air to and from the alveoli.
细支气管——支气管的细小分支，输送空气进出肺泡。
Bronchiole — Small branch of the bronchus that carries air to and from the alveoli.
肺气肿情形下，肺泡壁扩张，肺泡形成超出其限度的大的空气间。
In emphysema, the alveolar walls are enlarged, and large air Spaces have formed where the alveoli should be.
吸入的空气中的氧气就在肺泡里与来自周围毛细血管血液中的二氧化碳进行交换。
There oxygen in the inspired gas is exchanged for carbon dioxide from the blood in the surrounding capillaries.
在空气微粒吸入肺泡之后，也许会为血液溶解或吸收，从而直接进入体循环。
Deposited in the alveolar region, particulates may be dissolved and absorbed into the bloodstream, reaching the systemic circulation directly.
空气微粒吸入肺泡，也许会为血液溶解或吸收，直接进入体循环。
Deposited in the alveolar region, particulates may be dissolved and absorbed into the bloodstream, reaching the systemic circulation directly.
空气微粒吸入肺泡，也许会为血液溶解或吸收，直接进入体循环。
Deposited in the alveolar region, particulates may be dissolved and absorbed into the bloodstream, reaching the systemic circulation directly.
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