拓扑学是对图形在任何变形下保持不变的性质的研究。

在全球化时代，国家的比较优势越来越由创新能力而非传统要素禀赋决定。

There is only one boss. The customer. And he can fire everybody in the company from the chairman on down, simply by spending his money somewhere else.

He who knows only his side of the case knows little of that.

The true teacher defends his pupils against his own personal influence. He inspires self-trust. He guides their eyes from himself to the spirit that quickens him. He will have no disciple.