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first-class mail
commer.	第类邮件
commun.	密封〔第一类〕邮件
econ.	一等邮件
law	一类邮件; 头等邮件; 密封邮件系不受检查，邮资最高的
tech.	密封邮件
English thesaurus
First Class Mail
abbr., post	FCM

First Class Mail : 2 phrases in 2 subjects

Law	1
Public security	1