另函

xiáng qíng lìng hán

详情另函。

I will write you another letter about the details.

wǒ lìng hán jiāng shū jì gěi nǐ

我另函将书寄给你。

I'm sending you the book under separate letter.

xīn de shāng pǐn mù lù jiāng lìng hán fù yóu

新的商品目录将另函附邮。

The new catalog will be received by separate mail.