不到六个星期,她的症状就一去而不再复返了。
过去发生大流行时,流感病毒的传播需要六个多月才能达到新型H1N1病毒在过去不到六个星期内传播的广泛程度。
In past pandemics, influenza viruses have needed more than six months to spread as widely as the new H1N1 virus has spread in less than six weeks.
过去发生大流行时,流感病毒的传播需要六个多月才能达到新型H1N1病毒在过去不到六个星期内传播的广泛程度。
In past pandemics, influenza viruses have needed more than six months to spread as widely as the new H1N1 virus has spread in less than six weeks.
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