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which left a variety of f lakes attached to it (the rubbing process can be described as similar to ¡®¡®drawing by chalk on a blackboard¡¯¡¯). Õâ¾ÍÊÇʯīϩÔÚ²»Í¬»ùµ×ÉϵÄ×ªÒÆ¹ý³Ì¡£¿ÉÒÔ°þÀëµ½ºÜ±¡£¬µ«ÊµÏÖµ¥²ãµÄ¸ÅÂÊÌ«µÍÁË¡£ |

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