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[1] ¶ÎÏàÁÖ£¬µÈ¡£ÈËÌå×é֯ѧÓëÆÊ½âѧ£¨µÚ4°æ£©¡£2006Äê¡£¸ßµÈ½ÌÓý³öÊéÉ磬±±¾©¡£
[2] http://faculty.washington.edu/chudler/facts.html
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