æ¯ä¸ªåçµæºç»ååºæ¥ççµæAãBãCä¸ç¸ï¼è¿æä¸ç¸Nï¼ä¸æ§çº¿ï¼ï¼ä¸æ§çº¿ä¸è¬ä¸å¾å¤è¾çï¼å¨çµåå°±æ¥å°äºï¼ä½ å¨é«åéå¡ä¸çå°çæ¯äºæ ¹çº¿ï¼æä¸é¢ä¸¤æ ¹æ¯é¿é·çº¿ï¼ä¸é¢ä¸æ ¹æ¯AãBãCä¸ç¸ç«çº¿ã
追é®é£åçµå以å¤çn线å¢