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抛开工业方面的障碍，可能感冒难治的最大理由是，鼻病毒有很多类型而且对任何药物或疫苗都呈现出移动靶标。
Industry hurdles aside, perhaps the biggest reason the common cold has long defied treatment is that the rhinovirus has so many strains and presents a moving target for any drug or vaccine.
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