快信

yī fēng tè bié kuài xìn

一封特别快信

a special express letter

wǒ jiāng jì kuài xìn gěi nǐ

我将寄快信给你。

I'll send you the letter by express mail.

zhè fēng kuài xìn de fù jiā fèi shì duō shǎo

这封快信的附加费是多少？

What's the surcharge on this express letter, please?