结果表明：1日龄黄牛肺泡结构发育良好，但肺泡扩张不充分。
The result indicated that alveoli were well-developed, but they were incompletely inflated.
当腺泡近端的呼吸性细支气管扩张，而远端的肺泡扩张不明显，腺泡中央型肺气肿就会发生。
Centrilobular emphysema occurs with loss of the respiratory bronchioles in the proximal portion of the acinus, with sparing of distal 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.
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