尽管人很难被传染上禽流感，但专家们担心，病毒可能发生变异，产生出一种能够在人类之间传播的变种，引发世界性的大瘟疫。
Although it has been hard for people to catch, experts worry the virus could mutate into a form that passes easily among humans, sparking a pandemic.
尽管人很难被传染上禽流感，但专家们担心，病毒可能发生变异，产生出一种能够在人类之间传播的变种，引发世界性的大瘟疫。
Although it has been hard for people to catch, experts worry the virus could mutate into a form that passes easily among humans, sparking a pandemic.
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