I don't sing because I'm happy. I'm happy because I sing.

The knowledge of the circumstances of which we must make use never exists in concentrated or integrated form, but solely as the dispersed bits of incomplete and frequently contradictory knowledge which all the separate individuals possess.

Global challenges require local solutions with global perspectives.

投建营一体化是基础设施发展的未来趋势。

最优货币区是指能够以最小的实际经济干扰来稳定就业和价格的区域。