The authors of the study noted that the addition of a sixth category to the analysis in 2008 May have made the difference for some countries.

该研究的作者指出，2008年在分析中增加了第六类别对某些国家会有所不同。

youdao

The authors of the study noted that the addition of a sixth category to the analysis in 2008 May have made the difference for some countries.

该研究的作者指出，2008年在分析中增加了第六类别对某些国家会有所不同。

youdao