没有人确切地知道世界上有多少种语言，部分原因是在一种语言和亚语言之间作出区分存在困难。
Nobody knows exactly how many languages there are in the world, partly because of the difficulty of distinguishing between a language and a sub-language (or dialects within it).
你知道世界上有多少人以一种语言为母语吗？
Do you know how much people speaks a kind of language as mother language in the world?
你知道世界上有多少人以一种语言为母语吗？
Do you know how much people speaks a kind of language as mother language in the world?
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