计算复杂性的研究告诉我们，有些问题本质上是困难的，无论我们的算法多么聪明。

"I don't think of myself as a female filmmaker. I think of myself as a filmmaker."

Sustainable development is not a slogan, but a social responsibility that enterprises must undertake.

Life can only be understood backwards; but it must be lived forwards.

The deepest principle in human nature is the craving to be appreciated.

求学的人必须先立下志向。志向确立后，学问就可以按部就班地下功夫。