它们有时候会繁殖下一代，有时候则只是复制基因，直到时机成熟才将一大群子子孙孙打包送出去。

Sometimes they get in and get busy making babies. Other times they copy their chromosomes but hold off parceling them out to their army of offspring until the time is right.

youdao

当你有一个基因的两个复制品时，有利改变可能就会出现，使一个或两个复制基因能够出现新的功能，并保留老的功能。

When you have two copies of a gene, useful mutations can arise that allow one or both genes to explore new functions while preserving the old function.

youdao

Well, the genes that survive are going to be the ones that make the most copies of themselves.

能存活的基因是,能进行最多自我复制的基因。

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Now the plasmid started to do its thing, which is replicate and the gene gets transcribed.

那么质粒就可以开始进行复制,基因得以转录

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From the standpoint of your genes, you dying for the life of three brothers is an excellent compromise 50% because the genes replicate by fifty percent more.

从你自身基因的角度看，你为了三个兄弟牺牲自己,是非常好的折中,因为基因复制超过。

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