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科学家找到了禽流感迄今难以在人与人之间传播的原因,并且证明,即使它发生变异,也难以对人类构成太大威胁。但这依然只是一个初步结论
Scientists have found out why bird flu has so far failed to spread from person to person and have shown that even if it mutates, it is hard to pose a threat to humans. But this is still only a preliminary conclusion