贸易能够使各国都受益，即便是相对劣势的国家。
Trade between two countries can be mutually beneficial, even if one of them is less efficient in the production of all commodities.
A mathematical proof is a poem written in the language of logic.
经济学家的角色既是科学家，又是工程师。
I said, 'I will build you this incredible, gorgeous, gleaming hotel. I will put people to work in the construction trades and save hotel jobs and the Grand Central area will come around.' So the city made the deal.