正确句子：Nobody knows exactly how many languages there are in the world, partly because of the difficulty of distinguishing between a language and the sublanguage or dialects within it, but those who have tried to count typically have found about five thousand. 请问：distinguishing between a language and the sublanguage or dialects within it，这里为什么是within it，答案看了还是有点不理解。求讲解，谢谢啦！
within 后面的 it 指代 a language，因为它不可能指代sub-languages 或者 dialects (负数）。
句子应该这样复原：
...difficulty of distinguishing between A (a language) and B(sub-languages or dialects) within A (the language)...
……辨别一个语言和它（这个语言）之中的方言……
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发表于 2013-3-9 18:49:38
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