致函

jǐ yǔ zhì hán wèn hòu

给予致函问候

send one's greetings in a letter

qǐng zhì hán cǐ dì zhǐ

请致函此地址。

Please write to this address.

zhì hán zǒng tǒng

致函总统

write to the president

jǐn guǎn wǒ zhí jiē zhì hán bù zhǎng dàn shì tā méi yǒu gěi wǒ huí xìn

尽管我直接致函部长，但是他没有给我回信。

The minister did not reply to my letter although I addressed it to him personally.