HIV has proven to possess an ability to mutate into drug-resistant forms.
艾滋病病毒经证实能突变成抗药型病毒。
《柯林斯英汉双解大词典》
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Colds mutate even while they're infecting you, and new strains pop up so often that by the time drug-makers create a vaccine against one variation, the serum is already out of date.