A week passed before I received a formal letter from the company.

一个星期之后，我收到了这家公司的一封郑重其事的来信。

youdao

Blackpool have a week to respond to a formal letter from the League.

黑池可以在一周内对书面正式回复联赛。

youdao

If it's a formal letter you may want to use proper names like "Dear Ms. Smith".

如果是一封正式的感谢信，你可以以“亲爱的史密斯女士”这样一个比较恰当的称呼开头。

youdao

The European partners in the aircraft project, led by Italy's Alenia, secured a formal letter of intent last July.

ECONOMIST: Daimler-Benz

The figure has been circulated in an email, but it is not clear yet if a formal letter has been sent to the families.

BBC: People arrying body of injured man

Spratton Parish Council said it would now submit a formal letter of objection to Daventry District Council, which will rule on the plan in November.

BBC: Residents at the meeting at Spratton.