But I'm not asking you in any way, shape, or form to go backward.
但我不是让你以任何方式、任何形态或形式回到过去。
We can't go backward in relationships despite our longing for the thrill of those earliest, giggly dates.
尽管我们也渴望再次体验那些早前的天真傻笑的约会,但是我们恢复不了那种关系了。
But he thinks it can only go backward when the evolution of the trait is simple, like when a single mutation is involved.
但是他认为只有在新特征的进化是非常简单的情况下才可以逆转,例如只有一个位点发生突变。
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