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qǐng jǐn zǎo fù hán

请尽早复函。

Kindly favour us with an early reply.

tā wèi shōu dào rèn hé fù hán huò dá fù

她未收到任何复函或答复。

She has received neither an acknowledgment nor a reply.

suǒ yǒu de shēn qǐng dū huì dé dào fù hán

所有的申请都会得到复函。

All applications will be acknowledged.