覆信

nǐ wèi shén me bù fù xìn

你为什么不覆信？

Why don't you write a letter in reply?

qǐng jí shí fù xìn

请及时覆信。

Please reply in time.

lái zì jiā rén de fù xìn

来自家人的覆信

a reply letter from family