Because that's because each sac contains a cluster of alveoli, these tiny cavities lined with super thin, wet membranes made of simple squamous epithelium tissue.

因为这是因为每个囊包含一簇肺泡，这些微小的空腔内衬着由简单鳞状上皮组织制成的超薄湿膜。

Dr Schwartz and his team coaxed embryonic stem cells to become retinal pigment epithelium tissue which supports the rod and cone cells that actually respond to light

他的团队诱导胚胎干细胞成为视网膜色素上皮组织细胞－其中的杆细胞及锥晶细胞对光线敏感。

The cool thing about this layer is that it contains the endothelium, which you may remember is made up of simple squamous epithelium tissue and is continuous with the lining of the heart.

这层最酷的地方是它包含内皮，你可能记得内皮是由简单的鳞状上皮组织组成的，并且与心脏内膜连续。