" The coronavirus mutates just like any good RNA virus should, " added Mark Schleiss, a molecular genetics expert.

" 冠状病毒突变和其他任何正常的RNA病毒一样，" 马克·施莱希补充道，他是分子遗传学专家。

The simple explanation of molecular genetics involves four genetic " letters" .

分子遗传学的简单解释涉及四个遗传“字母”。