Bian ji zhu yi yi you liang ge ban shi ji de li shi, ta zai 19 shi ji mo qi he 20 shi ji chu qi fa zhan cheng wei xi fang jing ji xue de zhu liu, bing dui hou lai de jing ji xue de fa zhan you shen ke de ying xiang. ben shu zheng shi dui zhe duan li shi de zhuan men yan jiu.