Norwalk viruses (NVs) cause outbreaks of acute nonbacterial gastroenteritis and spread frequently through contaminated foods or water.是什么意思_Norwalk viruses (NVs) cause outbreaks of acute nonbacterial gastroenteritis and spread frequently through contaminated foods or water.在線(xiàn)翻譯_英語(yǔ)_讀音_用法_例句