Title: 20 shi ji xi fang da guo zi ben zhu yi guo you jing ji yan jiu =
Description: Ben shu yi li shi bian qian de shi jiao dui 20 shi ji xi fang zhu yao guo jia guo you jing ji de fa zhan yu bian ge guo cheng jin xing tan tao, Yi xiang jin de shi liao shu ju tong guo li shi yu xian shi xiang jie he, Ding liang fen xi yu ding liang fen xi xiang jie he deng fang fa qing xi di zhan xian 20 shi ji xi fang guo you jing ji shi ru he zai ge zhong yin su de xiang hu zuo yong he ying xiang xia jing li"xing sheng shuai"de fa zhan guo cheng, Cong er zeng jin dui xi fang guo you jing ji fa zhan wen ti de li jie.
Subjects: Guo you jing ji, Yan jiu
Places: Xi fang guo jia
Time periods: 20 shi ji