为了使分析简化，我们将把整个世界归纳为两个不同类型的国家——一个是低收入的墨西哥，另一个是高收入的美国。

To simplify the analysis, we shall aggregate the whole world into two stylized countries, a low-income Mexico and a high-income United States.

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利用净贸易条件指数和收入贸易条件指数从整体和分类2个层面对中国主要林化产品1992～2005年贸易条件进行分析，对2002～2005年世界主要林化产品地区结构进行分析。

This study deals with China's terms of trade in 1992-2005 through NBTT and ITT and world's region structure in 2002-2005 of major forest chemical products in a comparatively systematic way.

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