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头被砍掉还会疼? 揭秘十大最古怪问题(组图)(6)
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)

    为什么荨麻扎人那么疼？
    
    人的皮肤碰到荨麻后会感到难以忍受的疼痛，这是因为在与人的皮肤接触时，荨麻叶子上的柔嫩茸毛会受损，分泌出由三种化学物质组成的混合物，它们会引起灼痛感。
    
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