swine flu就是最近颇受关注的猪流感，全称为swine influenza，定义为a respiratory disease of pigs caused by type A influenza viruses that causes regular outbreaks in pigs（一种由A类流感病毒引起并在猪中间传播的呼吸系统疾病），此类病毒一般不会传给人类。但...
