Because,unlike software,which can be literally copied, as many as you want identical,the body can't split.

因为不同于可被不断拷贝的软件，肉体是不能分裂的。

耶鲁公开课 - 死亡课程节选

They're not chromosomal differences because this is the ordinary process of mitosis.

它们的染色体没有任何变化,因为这是正常的有丝分裂过程

耶鲁公开课 - 生物医学工程探索课程节选

The creation almost of a clean slate, even more so I would argue than the disruption that it came after the fall of Rome, because there's one big difference.

这几乎就是从一张白纸重新创作,甚至比起,我认为,比起紧随罗马陷落而出现的分裂更有价值,因为这两者有一个巨大的差别

耶鲁公开课 - 古希腊历史简介课程节选

In terms of function they're very important because this stem cell which is produced goes back into the population of stem cells and is able to repeat this process to form new committed progenitor cells and to form new stem cells.

但就功能而言这些干细胞则至关重要,因为这类分裂产生的子细胞,依然是干细胞,可以再次重复上述步骤,生成新的定向祖细胞,和新的干细胞

耶鲁公开课 - 生物医学工程探索课程节选