Ben shu de yan jiu yi 20 shi ji 80 nian dai chu yi lai de mei guo xing zheng gai ge wei yan jiu dui xiang, yi dian dai mian di tou shi dang dai xi fang xing zheng gai ge de shi jian qu xiang ji qi nei zai gui lü, bing shi tu dui zhong guo xing zheng gai ge ti gong mou xie qi shi yu jie jian.