Three-tier architecture - the domestic version of Bing
https://cn.bing.com/search?FORM=U227DF&PC=U227&q=%E4%B8%89%E5%B1%82%E6%9E%B6%E6%9E%84
Why are so many domestic companies indiscriminate use of three-tier C #? - know almost
https://www.zhihu.com/question/28076940
What is the MVC (three-tier) _ Baidu know
https://zhidao.baidu.com/question/744321491060765132.html
Three-tier architecture _ Baidu Encyclopedia
https://baike.baidu.com/item/%E4%B8%89%E5%B1%82%E6%9E%B6%E6%9E%84