second-class mail/post/stamp etcMAIL 邮件 relating to the system of delivering mail in Britain that is cheaper and slower 〔英国的〕第二类邮件/邮票等second-class mail/post/stamp etc• The quantity relative for second-class stamps is 140.0, indicating an increase in numbers bought of 40%.• First-class and second-class mail should be put through the machine on separate runs.
→ second-class mail/post/stamp etc at second-class(2)