åå¿åï¼åå¿ç¸ååå¾ä¸åçåãåå¿åç论ï¼ç±E·W·伯åæ¯äº1923å¹´æåºçãä»ä»¥èå å¥ä¸ºä¾ï¼è¯å¾åç«ä¸ä¸ªåå¸åå±ååå°ä½¿ç¨ç©ºé´ç»ç»æ¹å¼ç模åï¼å¹¶æä¾äºä¸ä¸ªå¾ç¤ºæ§çæè¿°ãæ ¹æ®ä»çç论ï¼åå¸å¯ä»¥ååæ5个åå¿ååºåã
æ°å¦å®ä¹
åä¸å¹³é¢ä¸åä¸åå¿èåå¾ä¸åçåã