任何圆的周长与其直径的比率小于3 1/7但大于3 10/71。
I don't think you should ever have to apologize for your excitement.
I'm the kinda guy that's mental.
最大的残忍是我们对他人绝望的随意漠视。
Technological innovation is the fundamental driving force for enterprise development, without innovation there is no future.