当他在各领域—包括消费者行为、财政学、国际贸易、商业周期—辛勤耕耘时，总是遭遇到一些类似的、屈从于数学技巧的同一局限的问题。
As he laboured in each field-consumer behaviour, public finance, international trade, business cycles-he encountered similar problems, which yielded to the same set of mathematical techniques.
我在国际贸易专业所修的课程包括国际市场营销学、谈判技巧、国际商业法、外贸英语、英语口译等等。
The courses I have taken in International Trade include International Marketing, Negotiation Techniques, International Business Law, English for Foreign Trade, English Interpretation, etc.
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