Zi ran yu ke xue tan suo Zi ran yu ke xue tan suo. Zi ran ke xue li lun Zi ran ke xue gai lun/ Yi shu yu ke xue/. Juan san. Wen hua yu zhe xue de tan suo/ Zi ran ke xue shi Zi ran ke xue wen xian jian suo/ Ke xue yu ren wen de tan suo. Zi ran yi xue bai ke =