This respiratory surface, also known as the respiratory membrane, includes the alveolar epithelial cells as well as the pulmonary capillary endothelial cells.

呼吸表面，也称为呼吸膜，包括肺泡上皮细胞和肺毛细血管内皮细胞。

The respiratory membrane is very thin, as it consists of only two cells - that is, the alveolar epithelial cell and the pulmonary capillary cell.

呼吸膜很薄，因为它只有两个细胞，即肺泡上皮细胞和肺毛细血管细胞。

Oxygen and carbon dioxide move across what we call the respiratory surface, and that consists of an alveolar epithelial cell and a pulmonary capillary endothelial cell.

氧气和二氧化碳通过我们所称的呼吸表面移动，它由肺泡上皮细胞和肺毛细血管内皮细胞组成。