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the flu is a contagious respiratory illness caused by influenza viruses

the flu is a contagious respiratory illness caused by influenza viruses

标签: the,flu,is,a,contagious,respir
noroviruses are a group of viruses that cause the stomach flu or gastroenteritis

noroviruses are a group of viruses that cause the stomach flu or gastroenteritis

标签: noroviruses,are,a,group,of,vir
man taking his temperature with an oral thermometer while participating in an influenza swine flu vaccine test

man taking his temperature with an oral thermometer while participating in an influenza swine flu vaccine test

标签: man,taking,his,temperature,wit

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flu 风景 flu 高清 flu 背景 flu 壁纸 自然 flu