¨„Step 3£ºÔö¼ÓÈÕ³£Ô˶¯Á¿
1¡¢¾Ã×øÒ»×åµÄÄ㣬ҲÄÜÔÚÒÎ×ÓÉϳä·ÖÔ˶¯¡£ÇüÏ¥²¢Â£Ë«ÍÈ£¬×øÓÚÒÎ×ÓµÄ2/3´¦£¬´óÍÈÓëСÍȳÉ90¶È£¬×øÖ±ÉÏÉí±³²¿ÍùÉÏÉìÕ¹£¬Óë´óÍÈ´¹Ö±£¬Á½ÊÖ·ö×ÅÒÎ×ÓÇ°²à¡£
2¡¢²¢Â£µÄË«ÍÈÍùÉÏ̧Æ𣬽ÅÕÆÍùÉϱÁ½ô£¬Ï¥¸Ç̧ÖÁÓëÐØͬ¸ßµÄλÖÃÉÏ£¬´óСÍȵļнÇÖð½¥ÊÕ££¬¸¹²¿¼¡ÈâÊÜѹ£¬ÊÖ±Û³ÅÖ±±£³Ö20Ãë¡£