As a rule, language once within our control can be employed for oral or for written purposes.

通常，一旦我们控制了语言， 就可以将其用于口头或书面目的。

This simplified example illustrates a major problem: it takes a lot of data from each individual language to establish the rules for that language, before we can even begin to determine which rules all languages might have in common.

这个简化的例子说明了一个主要问题：在我们甚至可以开始确定所有语言可能有哪些共同规则之前，需要从每种语言中获取大量数据来建立该语言的规则。