When copying the mutated gene, DNA polymerase can basically lose track of which CAG it's on and accidentally add extra CAGs.

在复制突变基因时，DNA聚合酶基本上无法定位它所处的CAG位置，并由此意外添加了额外的CAG。

There, cellular machinery that normally copies the host's genes starts replicating viral genes instead, creating more and more copies of the virus.

在那里，通常复制宿主基因的细胞机器开始复制病毒基因，从而产生越来越多的病毒拷贝。