Title: Zi ran shi
Description: "Zi ran shi " shi yi bu bo wu zhi, bao kuo di qiu shi, ren lei shi, dong wu shi, niao lei shi he kuang wu shi deng ji da zong fen, dui zi ran jie zuo liao jing que, xiang xi, ke xue de miao shu he jie shi, bing yin qi wen bi you xiu er zhu chen yu shi.
Subjects: Zi ran ke xue shi, Qing shao nian dou wu .
Places: Shi jie