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国际贸易理论中,有一个著名的比较优势原理:在美国,每单位投入能生产25千克小麦或8米布,而在世界其他地区,每
In international trade theory, there is a well-known principle of comparative advantage: in the United States, each unit of input can produce 25 kilograms of wheat or 8 meters of cloth, while in the rest of the world,