This means that their RNA is actually mRNA, and the host cell ribosomes use this mRNA to make a long polyprotein chain, which is then broken into smaller pieces by viral proteases.

这意味着它们的RNA其实就是信使RNA；宿主细胞中的核糖体可以用这些信使RNA制造一条长多肽链，随后被病毒蛋白酶分解成小片段。