Terms containing first-class mail

Subject	English	Chinese
law	first-class mail	头等邮件
law	first-class mail	密封邮件系不受检查，邮资最高的
tech.	first-class mail	密封邮件
econ.	first-class mail	一等邮件
commun.	first-class mail	密封〔第一类〕邮件
commer.	first-class mail	第类邮件
law	first-class mail	一类邮件
publ.secur.	first-class mail matter	第一类邮件物品
law	first-class mail matter	一类邮件物品