信函

hé mǒu rén yǒu xìn hán wǎng lái

和某人有信函往来

have an exchange of letters with

kǒu shòu xìn hán

口授信函

dictate a letter

diàn zǐ xìn hán

电子信函

electronic mail

xìn hán jiā

信函夹

a file of letters

tā qǐ cǎo le yī fèn gěi biān jí de biāo zhǔn xìn hán

他起草了一份给编辑的标准信函。

He drafted a standard letter to the editors.