Formal language is different from informal language in several ways.
正式语言与非正式语言在许多方面都不同。
The letter was in informal language.
这封信使用了非正式的语言。
The result is a very earthy, informal language.
结果是一个非常朴实的，非正式的语言。
But they prefer informal language when they talk to friends.
但是当他们和朋友谈话的时候，则较喜欢使用非正式的语言。
The borderline between informal language and slang is hard to define.
口语和俚语之间的分界线是很难确定的。
In my opinion, we can use the Internet language in informal occasions.
在我看来，我们可以在非正式场合使用网络语言。
Informal logic is the study of natural language arguments.
非形式逻辑是研究自然语言的论点。
Informal logic is the study of natural language arguments.
非形式逻辑是研究自然语言的论点。
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