if (n <= 1) return n;
User-friendly interface，详情可参考旺商聊官方下载
"People come into your office and say they're not having a very good day, or something's happened at home, and you have to try and see if you can support them. It's very varied."，这一点在搜狗输入法下载中也有详细论述
Credit: Hisense。关于这个话题，91视频提供了深入分析