Merge pull request #69 from wpajqz/dev

语言更严谨
错别字修正
Merge pull request #70 from xjmarui/master

错别字修正
简单文字性错误修改
Merge pull request #71 from xjmarui/master

简单文字性错误修改
Update 2.3.md
Merge pull request #72 from shinwu/patch-1

Update 2.3.md
Update 2.5.md

fix code bug
Merge pull request #73 from smallslime/master

Update 2.5.md
upgrade .