So their respiratory surfaces moved from their outer surfaces to the insides of their bodies.

所以它们的呼吸表面从身体的外表面移到了身体的内脏。

Now, this respiratory surface is also referred to as the respiratory membrane.

现在，该呼吸表面也称为呼吸膜。

Therefore, we use the term gas exchange, as oxygen is exchanged for carbon dioxide across the respiratory surface.

因此，我们使用气体交换这个术语，因为氧气在呼吸表面被交换成二氧化碳。

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。

Did you know that our cell membranes, including those that make up the respiratory surface, are composed of fat-like, or lipid, molecules?

你知道吗，我们的细胞膜，包括构成呼吸表面的细胞膜，是由类似脂肪或脂质的分子组成的？

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。