polaris16251

没有 significant decline since 1993，题目里只有 insignificant decline since 1993好像
Karmalotse 发表于 2012-8-13 06:37

Nitrogen dioxide is a pollutant emitted by automobiles.Catalytic converters, devices designed to reduce nitrogen dioxide emissions, have been required in all new cars in Donia since 1993, and as a result, nitrogen dioxide emissions have been significantly reduced throughout most of the country.Yet although the proportion of new cars in Donia's capital city has always been comparatively high, nitrogen dioxide emissions there have showed only an insignificant decline since 1993.


我是问红色那部分的significantly reduced 原因，不是蓝色那部分