Psychology must study the adaptive functions of thought and behavior.

A mathematician's work is never done; there are always new questions to explore and new mysteries to uncover.

加强国际合作，推动煤炭行业技术和管理水平的提升。

后世的君主却不是这样，认为天下的利害大权都出于自己。

The value of art is not in its price, but in its power to move people.