3、禽流感病毒目前已经在亚洲4个国家感染了117人，造成60多人死亡。这种病毒还在不断变异，在这个问题上专家们的意见异乎寻常地统一。他们纷纷警告说，如果在今后两年内，禽流感病毒通过变异能够在人与人之间传播，人类将会遭受一场前所未有的大灾难。
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答案解析：avian influenza viruses have now infected one hundred and seventeen people in four countries in asia, causing the death of more than sixty people. this kind of viruses are still varying constantly, on which experts have reached an unusual consensus. one of them after another has warned that if avian influenza viruses can be transmitted among people by variation within the two years to come, humankind will surely suffer from an unprecedented catastrophe.
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