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。

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Another difference between formal and informal language is some of the vocabularies.

正式语言和非正式语言的另一个区别是一些词汇的不同。

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Informal language is used in conversation with colleagues, family members and friends, and when we write personal notes or letters to close friends.

在与同事、家人和朋友的交谈中，以及在给亲密朋友写私人便条或信件时，我们会使用非正式的语言。

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Language is a kind of informal plebiscite: when we adopt a new word or alter the usage of an old one, we're casting a voice vote for a particular point of view.

NPR: 'Talking Right': Why the Left Is Losing, Linguistically

In an informal interview with journalist Ilya Zhegule on the eve of his death, and published on Forbes' Russian language website, Mr Berezovsky reportedly said his life no longer made sense and spoke of his desire to return to Russia.

BBC: UK