Silence can be the loudest form of protest.

To write a good love letter， you ought to begin without knowing what you mean to say， and to finish without knowing what you have written.

The task of economics is not only to interpret phenomena, but also to provide practical advice and policies for society.

一座建筑必须忠于它自己。

局部和全局现象之间的相互作用是数论中反复出现的主题。