Guo jia zi ran ke xue ji jin. Guo jia zi ran ke xue ji jin wei yuan hui. Wo de zi ran ke xue ke / Guo xiao zi ran ke jiao xue fa xin lun/ Wo de zi ran ke xue ke/ Zi ran ke xue li lun Zhong guo guo jia zi ran ke xue ji jin wei yuan hui guo ji jian die gu shi Zi ran ke xue gai lun/ guo jia ji guan gong zuo ren yuan