去年三月在墨西哥出现的猪流感，也是混合病毒感染了猪、鸟和人类之后，产生的新流行病毒。
The swine flu pandemic that emerged in Mexico last March also resulted from the mixing of viruses that infected pigs, birds and humans to create a new pandemic strain.
去年三月在墨西哥出现的猪流感，也是混合病毒感染了猪、鸟和人类之后，产生的新流行病毒。
The swine flu pandemic that emerged in Mexico last March also resulted from the mixing of viruses that infected pigs, birds and humans to create a new pandemic strain.
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