4. ²à³Åʽ
¹¦Ð§£ºÇ¿½¡±³²¿ºÍ¸¹¼¡£¬ÖØËÜÉíÌåÁ½²à¼°ÊÖ±ÛÏßÌõ
Æðʼ×ËÊÆΪÏÂȮʽ£¬Ë«½Å²¢Â£¼Ð½ô´óĸ½ÅÖº¡£½«ÓÒÊÖÏò×ó±ß¿¿Â£ÖÁè¤Ù¤µæÖÐÉÏ·½¡£ÏòÉϷת90°Ê¹ÉíÌ峯ÏòÓҲ࣬ÓҽŸú×ŵأ¬ÓÒ½ÅÉÔÉÔÍäÇú¸¨ÖúÉíÌå±£³Öƽºâ¡£ÂýÂý̧Æð×ó±Û²¢ÏòÉϾÙÆð¡£±£³ÖÕýÈ·µÄ×ËÊƲ¢Ê滺µØºôÎü5´Î¡£