- outgoing correspondence
- 外: outside; external side
- 发信: post a letter; send transmit ...
- 件: piece; article; item
- 带外发信: out of band signaling; out-of-band signaling; out-of-band signalling
- 信件: letter; mail; missive 打印信件 a form letter; 商业信件 business letter; 发出的信件 an outgoing letter; 友好的信件 a friendly letter; 他每天有大量的信件要回复。 he has a large amount of mail to answer every day
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