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.
Worldlib国外文献整合平台(以下简称Worldlib)团队通过参考国内500余所重点本科高校OA资源使用情况,整理出采集的目标网站,涵盖了国外优秀大学及科研机构的OA资源,如Elsevier、Springer、Taylor & Francis Group、DOAJ、EBSCO、IOP、Wiley等免费开放期刊资源,OATD收集了世界各地1100多所高校发布的3,559,281篇开放获取研究生论文和论文等。