很久之前，这基因复制了并且产生了基因突变。

Long ago, the gene duplicated and the new copy mutated.

这是因为它们的RNA中有一种会造成基因复制过程不断出错的机制。

This is because of a machinery in their RNA that causes consistent errors in gene replication.

任何能使更多基因复制并传给后代的机制都可以达到这个目的，除了进化的目的。

Anything that lets more copies of the gene pass on to the next generation will serve its purpose, except evolutionary purpose.

最常用的那些临床药物可以阻止病毒的基因复制并合并入宿主细胞DNA。

The most commonly prescribed ones prevent the viral genome from being copied and incorporated into a host cell's DNA.

目的探讨人巨细胞病毒(HCMV) 潜伏和活动性感染状态下病毒基因复制特点.

Objective To explore the viral replication in HCMV latent and active infection in vitro.

刚出生四个月的小羊，抢著吃草。这对羊宝宝的妈妈，就是台湾第一只基因复制羊。

The four-month-old goats fight over the hay. Their mother is Taiwan's first cloned goat.