per cent developed的意思 .求高手帮忙翻译一句话

per cent developed的意思 .求高手帮忙翻译一句话probably a large fraction oniy of the per cent developed in increase of national product.这句话是什么意思?不要用翻译软件的答案，翻译软件我也会用，我就是判断不出来这句话的结构，翻译不出来。请英文高手帮忙一下，谢谢哦。谢谢后来的两位朋友，段落是It is doubtful if United Statesexports will have any great growth in these future years; probably a largefraction oniy of the per cent developed in increase of national product.However, those countries in Trade Agreement areas will show remarkableresults especially in the indmtrial products with regional comparative advantage.这是一篇外贸研究的专业文献。谢谢各位