Free from particles, the inhaled air is now in the alveolus surrounded by mostly type I pneumocytes.

移出异物后，肺泡中的空气周围围绕的大多是I型肺泡细胞。

The pneumocytes and the capillaries are glued together with a protein layer called basement membrane.

肺泡细胞和毛细血管由称为基底膜的蛋白质层粘合在一起。

On the other side of the pneumocytes are endothelial cells that line the capillary walls, which is what holds the blood.

而肺泡细胞的另一边就是毛细血管壁的内皮细胞，毛细血管携带的便是我们亲爱的血液。

Like the club cells, the type II pneumocytes are capable of transforming into type I pneumocyte, so they can also help regenerate and replace damaged cells.

如同棒状细胞，II型肺泡细胞也可以转化成I型肺泡细胞以及替代和修复受损的细胞。

The alveolar wall has a completely different structure from the bronchioles - there are no cilia or smooth muscle, and instead the wall is lined by thin epithelial cells called pneumocytes.

肺泡壁与支气管壁结构完全不同，没有纤毛和平滑肌；相反，管壁内有大量薄层上皮细胞，称为肺泡细胞。

Most are regular pneumocytes called type I pneumocytes, but some, called type II pneumocytes, have the ability to secrete a substance called surfactant, which helps decrease the surface tension within the alveoli and keeps them open.

大部分为I型肺泡细胞，还有一些为II型肺泡细胞可以分泌一种表面活性剂，这有助于降低肺泡内的表面张力，并保持它们的开放。