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.

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不断增长的贸易量——更多的商品和服务进出美国——对许多行业来说都是好消息。

The rising volume of trade—more goods and services shuttling in and out of the United States—is good news for many sectors.

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尽管中国的货币在帮助本国向他国出口产品和服务方面功不可没，但是中国6月的贸易顺差却另有其因。

Although China's currency has generally helped the country sell goods and services cheaply abroad, June's trade surplus has more to do with factors beyond the yuan's value.

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