When I talked about mitosis, I talked about cells making perfect copies of each other, so each parent cell becoming two daughter cells that are the same.

我讲有丝分裂的时候,谈到过细胞能够完美的复制自己,母细胞分裂成为,两个完全一样的子细胞

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That's one of the properties of mitosis, that the DNA gets completely duplicated during the S phase, during DNA synthesis phase.

有丝分裂的一个特征,就是DNA在S期内完全复制,S期就是DNA合成期

耶鲁公开课 - 生物医学工程探索课程节选

It's totally synthetic, there's no micro-organism involved in making the DNA for you, You can do it very rapidly in a laboratory, and fairly inexpensively now.

完全是复制的过程,没有任何微生物参与制造DNA,你可以在实验室里迅速地进行,费用现在也相当便宜了

耶鲁公开课 - 生物医学工程探索课程节选