In his classic etymological dictionary Shuowen Jiezi written nearly 2000 years ago, Xu Shen showed how every character can be analyzed by breaking it into component characters, which themselves can be broken down further, so that ultimately only a couple hundred root pictographs and ideographs (wen) generate all of the characters.
Japan Digital Archives Center(J-DAC)日本数字档案中心是一个集成日本人文社会科学领域贵重资料的在线数据库。由Maruzen Matsudo有限公司和大日本印刷有限公司于2012年共同开发,这些文献史料主要来自日本各高校及图书馆所藏,内容涵盖日本政治史、经济史与商业史等诸多方面。