Let's forget about a letter, let's stick with an e-mail, or a text message.

就算你没有写过信，写电子邮件，发短信也算一种写作。

普林斯顿公开课 - 人性课程节选

Could you tell us about a person who wrote a recommendation letter for you?

你能给我们介绍一位给你写推荐信的人吗？

写推荐书的人 - SpeakingMax英语口语达人

We'll be talking about the fact that this is an interval of a third; it spans three letter names a little bit later on.

我们以后会谈到,这其实是个三度音程,它跨越了三个音名

耶鲁公开课 - 聆听音乐课程节选