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头被砍掉还会疼? 揭秘十大最古怪问题(组图)(4)
2007-08-20 09:46:43 【大 中 小】 发表评论
    
    
头被砍掉还会疼? 揭秘十大最古怪问题(组图)

    人体共存在着多少种微生物？
    
    大约200种，其中约80种生活在人的口腔里。我们的身体是一座微生物工厂，每天生产出一千亿到一百万亿个细菌。
    
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