Title: Zi ran ke
Description: Ben shu jiang dai ling hai zi men gen sui da zi ran de jiao bu, Zou guo xia ji, Qu gan shou xia tian de jie qi, Fa xian dong wu, Zhi wu, Qi xiang, Wu hou deng de dian di bian hua, Tan suo zi ran de ao mi.
Subjects: Shao nian du wu, Zi ran ke xue