For example, after menopause, estrogen production stops, which leads to death of the alveolar cells.

例如，停经后，雌激素分泌停止，会导致腺泡细胞死亡。

As a result, during every menstrual cycle, the alveolar cells undergo division and apoptosis.

因此，在每一个月经周期中，腺泡细胞都会经历分裂增殖和凋亡的阶段。

These hormones stimulate the alveolar cells to divide and increase in number, which makes the lobule enlarge.

这些激素刺激腺泡细胞分裂增殖，使小叶增大。

Without these hormones, the glandular cells, particularly the alveolar cells, cannot survive, and undergo apoptosis which is programmed cell death.

如果没有这些激素，腺体细胞，尤其是腺泡细胞将无法存活，并会凋亡，即程序性死亡。

Just like healthy alveolar cells, some breast cancer cells have hormone receptors that allow them to grow in the presence of the hormones.

就像健康的腺泡细胞一样，一些乳腺癌细胞也有激素受体，会使它们在激素作用下生长。

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。

Zooming in on the alveoli, there's a layer of alveolar cells that secrete breast milk into the lumen which is the space in the center of the gland.

放大腺泡来看，这里有一层腺泡细胞向腔内分泌乳汁。

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。