As DNA develops, chemical changes take place. While the DNA itself does not change, the way in which individual genes are expressed may vary between the twins.
随着DNA的进化，化学反应开始发生。虽然DNA本身并没有改变，但它在个人身上的表现显性就会出现很大的不同。
As DNA develops, chemical changes take place. While the DNA itself does not change, the way in which individual genes are expressed may vary between the twins.
随着DNA的进化，化学反应开始发生。虽然DNA本身并没有改变，但它在个人身上的表现显性就会出现很大的不同。
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