"The world is a book, and those who do not travel read only one page."

It is not from the benevolence of the butcher， the brewer， or the baker that we expect our dinner， but from their regard to their own interest.

生存，还是毁灭，这正是问题所在。

对任何模型的最大期望是它能提供一个对现实有用的近似。

The core competitiveness of an enterprise lies in its unique resources and capabilities.