本文研究认为，货物贸易和服务贸易差额的替代性体现了不同国家的比较优势所在。
This paper argues that the substitution relation between the balance of trade payment in service and goods results from comparative advantage of different countries.
急谁快给谁分，中文回答！问题翻译：如何使用弹性的方法，以贸易差额研究一个国家的国际贸易平衡?。
How to use the Elasticity Approach to the Balance of Trade when we study a country's international trade balance?
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