中英释义：
双语例句
公务信件在早晨开启。
The office mail is opened in the morning.
公务信件常见出现全文小写，并且飞速的信件在几次往来后由正式变得亲近？
It is common for business messages to appear entirely in lower case, and many rapid-fire correspondences evolve from formal to intimate in a few back-and-forths.
重点词汇
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公务
public affairs; official business; government service; public service; official; public; governmental
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信件
letter; mail; correspondence; missive