封口: seal信件: letter; mail; missive密: secret押: give as security; mortgage; ...開口信件: unsealed letter信件: letter; mail; missive 打印信件 a form letter; 商業(yè)信件 business letter; 發(fā)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復(fù)。 he has a large amount of mail to answer every day寄往中國內(nèi)地的出口信件: outward china letter按信件: by mail公文;信件: missive信件,字母: letter信件磅: letter-scales信件組: newsgroup依信件: by mail郵遞,信件: mail證書,信件: letter保留信件: retained correspondence報(bào)刊信件: newspapers and letters撥款信件: allocation letter不干涉信件: no action letter超重信件: overweight letter抄寫信件: copy letter處理信件: handling letters傳遞信件: deliver mail傳閱的信件: a circular letter打印信件: form letter