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

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So, in general, when cells are proliferating they're dividing and they're dividing at a regular rate.

因此,大致而言,当细胞增殖时,它们是在分裂,并以受调控的频率分裂

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Not all the cells are dividing; in fact, cells in your brain don't proliferate at all.

不是所有细胞都能分裂,事实上,脑细胞根本不增殖

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