He opened Ingrid's letter by mistake.

他误拆了英格丽德的信。

《柯林斯英汉双解大词典》

She sent the letter by airmail.

她寄的是航空信。

《牛津词典》

We sent the letter by air mail.

我们通过空邮寄信。

youdao

The sign is formed by a line across the right foot of the letter "R."

VOA: special.2009.03.22

It's the Easter letter by the Bishop Athanasius, who was Bishop of Alexandria.

它是阿萨内修斯主教写的复活节书信，他是亚历山大市的主教。

耶鲁公开课 - 新约课程节选

So notice this guy, another guy sort of forging another letter by Paul.

所以这个人。。。,另一个人伪造了一封保罗的书信。

耶鲁公开课 - 新约课程节选

Asness ends the letter by acknowledging the personal risks he takes by speaking out.

FORBES: Magazine Article

We regret any inconvenience and expect to send affected taxpayers a corrected letter by next week.

CNN: IRS erred on some tax refund letters; vows checks will be correct

Mr Taylor has requested that the Pirate Party UK respond to the BPI's letter by 6 December.

BBC: Music industry group BPI demands pirate proxy closure