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它们分泌一些可以诱导血管增殖的化合物，而这些血管可以供给它们生长所需的营养并且可以让他们渗透进入相邻器官的内部。

They secrete compounds that induce a proliferation of blood vessels that feed their growth and allow them to infiltrate the walls of adjacent organs.

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鸟胚中的刚毛结构来自于被称为基板（placode）的微小皮肤细胞结构，基板顶端快速增殖的细胞环形成了刚毛的圆柱井结构。

In the bird embryo these bristles erupt from tiny patches of skin cells called placodes. A ring of fast-growing cells on the top of the placode builds a cylindrical wall that becomes a bristle.

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They found that certain cells, in particular, epithelial cells from monkey kidneys, were very effective at propagating the virus.

他们发现有些细胞,尤其是在猴肾脏的上皮细胞中,这种病毒能够有效地增殖

耶鲁公开课 - 生物医学工程探索课程节选

In fact, they're no longer capable of reproducing; all they can do is exist as red blood cells and then die.

事实上,红细胞已经不能再增殖了,它们所能做的只是,作为红细胞过完一生然后死去

耶鲁公开课 - 生物医学工程探索课程节选

This process of cell proliferation or cell division is, of course, very important during development of an embryo.

细胞增殖和分裂的过程,在胚胎发育中至关重要

耶鲁公开课 - 生物医学工程探索课程节选