There is a small group of patients who develop AIDS very slowly, or never at all.
只有一小部分病人发病较缓慢或者不发病。
According to the U. S. daily scientific network reported, for a long time to develop AIDS vaccine is a major obstacle to AIDS virus (HIV) with a high degree of genetic variability.
据美国每日科学网报道，长期以来，研制艾滋病疫苗主要障碍是艾滋病病毒(HIV)具有高度的遗传变异性。
According to the U. S. daily scientific network reported, for a long time to develop AIDS vaccine is a major obstacle to AIDS virus (HIV) with a high degree of genetic variability.
据美国每日科学网报道，长期以来，研制艾滋病疫苗主要障碍是艾滋病病毒(HIV)具有高度的遗传变异性。
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