Correct
来函
/ láihán /
Strokes
Definition
incoming letter/letter from afar/same as 来信
Example
As a Noun
incoming letter; letter received
1
Láihán
来函
jìngxī
敬悉
,
chífù
迟复
wéi
为
qiàn
歉
。
I'm honoured to have received your letter, and sorry for not having been able to reply earlier.
As a Verb
send a letter here
2
Qǐng
请
láihán
来函
gàozhī
告知
zhǔnquè
准确
rìqī
日期
。
Please inform us of the exact/precise date by letter.
3
Duìfāng
对方
lián
连
lái
来
shǔ
数
hán
函
xúnwèn
询问
xiángqíng
详情
。
The other party kept writing to us to inquire the particulars.