They do build a new, permanent, cellulose wall to separate parent cells from their offspring, though.

不过，它们确实建立了一个新的、永久的，亲本细胞与后代细胞分开。

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的内皮细胞，毛细血管携的便是我们亲爱的血液。

The thread-like fibers we see — thinner than a human hair — are the remains of those dense, dried out walls of cellulose.

我们看到的丝状（比人类毛发还要细）是那些紧实干燥的（原细胞）的残留物。

High blood pressure is a serious problem for the blood vessels because it causes wear and tear on the endothelial cells that line the inside of the blood vessels.

高血压对于血管来说是一种很严重的疾病，因为它会导致血管内皮细胞的破坏及撕裂。

Now these free-floating platelets don't clump together during regular circulation — that would be terrible — but when the endothelial cells lining a blood vessel wall tear, the underlying collagen fibers are suddenly exposed.

这些自由漂浮的血小板在正常的血液循环中不会凝结在一起——那太可怕了——但是当血管内皮细胞撕裂时，其底层的胶原突然暴露出来。