Evolution is irreversible - at least at a molecular level.
进化是不可逆转的——至少在分子水平上是如此。
Basically, at a molecular level, its just milk.
基本上，在分子水平，这只是牛奶。
It is not like a medical discovery at the basic science molecular or cellular level.
它不像基础医学分子或细胞水平上的医学发现。
Techniques to deal with genes at the molecular level are a most important advance.
水平上对基因操作的技术取得了极重要的进展。
Techniques to deal with genes at the molecular level are a most important advance.
水平上对基因操作的技术取得了极重要的进展。
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