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甲型H1N1流感暴发以后,口罩出现在墨西哥城各个角落,使得这座城市俨然成了一座“口罩之城”。而专家的意见是:口罩只能给自己一些心理安慰,预
After the H1N1 flu outbreak, the mask appeared in every corner of Mexico City, making the city a “mascot city.” The expert’s opinion is: masks can only give yourself some psychological comfort, pre-