分子演化被认为在很大程度上是由稍微有害的氨基酸取代的传播驱动的。

If protein evolution is due in large part to slightly deleterious amino acid substitutions, then the rate of evolution should be greater in proteins that contribute less to individual fitness.

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竹节虫确实是重新长出了翅膀，但是还并不清楚在分子水平上这是不是逆演化。

The stick insects may indeed have evolved a new set of wings, but it is not clear whether this change appeared as reverse evolution at the molecular level.

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他表示，驱动人类神经系统、肌肉和心脏的相同分子体系演化成了一种仅仅用来发电的器官。

The same molecular machinery that drives our nervous system, muscles and heart has evolved into an organ just to produce electricity, he said.

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