He wonders exactly how the RNA viruses are infecting cells without harming them, allowing them to become a part of an animal's DNA.

他想要确切的知道RNA病毒是如何在不伤害细胞的情况下感染细胞的，并且能使他们成为动物基因中的一部分。

youdao

All are RNA viruses, which means they can't easily convert their genetic material into DNA, a necessary step for integrating into an animal's genome.

他们都是核糖核酸病毒(RNA病毒)，这就说明了他们不能轻易地将他们的遗传物质转化成dna，这是一个整合成动物基因组的必要步骤。

youdao

DNA is the carrier of heredity information of all biology except few RNA viruses.

除少数rna病毒外，DNA几乎是所有生物遗传信息的载体。

youdao