文学让我们在一生中活出千种生活。
I have already carried out my duty. I have proved the Poincaré conjecture and I have nothing more to do in mathematics.
Capitalism, then, is by nature a form or method of economic change and not only never is but never can be stationary.
性别经济学并不是一个小众主题;它是理解现代经济体的核心。