They are often used in formal letters.

它们常用于正式的信函中。

youdao

To summarize stories and write essays and formal letters.

能写故事梗概、论文及正式书信。

youdao

Will you have to write formal letters? Informal letters? Summaries?

你要写标准信函？非正式信函？还是总结？

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Mr Straw said he would examine the "reported comments", but the Libyan Government had made its stance on both Lockerbie and Wpc Fletcher's death "crystal clear" in formal letters.

BBC: NEWS | UK | Politics | Libyan PM denies country's guilt

Forget about cover letters, perfect resumes and formal applications.

FORBES: How To Find a Good Job? Go Partying!

"We've quite strongly have demanded there should be a formal hearing, rather than an exchange of letters so the community can have its say, " Mr Skill said.

BBC: The Halfway House pub