- by mail
- 按: press; push down
- 信件: letter; mail; missive
- 按信件收费的政务电报: government letter-rate telegram
- 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
- 按信道计费: ppc pay per channel
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