Query4All.com
国人做黑奴
Data generated from past analysis.
https://m.thepaper.cn/baijiahao_15161541
https://www.bbc.com/zhongwen/simp/world/2013/10/131017_world_slave_index_china
https://baijiahao.baidu.com/s?id=1601963412274593233
https://zh.wikipedia.org/zh-cn/%E5%A5%B4%E9%9A%B6%E5%88%B6%E5%BA%A6
https://www.zhihu.com/question/34079673/answer/1282882143
https://zhidao.baidu.com/question/438381165394540484.html
https://zh.wikipedia.org/wiki/%E7%BE%8E%E5%9C%8B%E5%A5%B4%E9%9A%B8%E5%88%B6%E5%BA%A6
https://k.sina.cn/article_6440116063_17fdc5f5f0010050zj.html
https://club.6parkbbs.com/other/index.php?app=forum&act=threadview&tid=13432737
http://lishisxk.com/ls/18103.html