Yes it may however these cases occur in humans with DIRECT contact with pigs such as those working in farms. Swine flu viruses do not normally infect humans.是什么意思_Yes it may however these cases occur in humans with DIRECT contact with pigs such as those working in farms. Swine flu viruses do not normally infect humans.在線(xiàn)翻譯_英語(yǔ)_讀音_用法_例句