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头被砍掉还会疼? 揭秘十大最古怪问题(组图)(7)
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)

    大自然有没有创造出轮子？
    
    大自然中确实存在轮子，只不过人们不久前刚刚发现这一点。微生物利用圆盘来进行移动。细菌依靠细胞膜上的“小轮子”来行动，这些轮子以令人难以置信的高速转动。
    
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