正式而且生硬的备忘录、文件已经过时了，而非正式、易理解的书面交流则开始流行。

Formal, stilted memos and documents are out; informal, accessible written communications are in.

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一个合同可以是正式或者非正式的，口头的或者书面的。

A contract might be formal or informal. oral or written.

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数据表明话语标记语在正式的和非正式的英语口语和书面语中出现相当频繁。

Statistics show that they occur frequently, in both formal and informal English speech and writing.

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