任何圆的周长与其直径的比率小于3 1/7但大于3 10/71。

Discipline in capital spending separates the winners from the losers in this business.

The interplay between syntax and semantics is central to the study of formal languages.

我无法预测未来，但我可以创造未来。

A esperança é a última que morre, mas é a primeira a renascer.

I think that the role of the mathematician is to discover these patterns and to explain them.