This paper introduced the conception and function of biosecurity system of livestock farm and pointed out some aspects that should be paid attention to when construct such biosecurity system.是什么意思_This paper introduced the conception and function of biosecurity system of livestock farm and pointed out some aspects that should be paid attention to when construct such biosecurity system.在線(xiàn)翻譯_英語(yǔ)_讀音_用法_例句