The cost of third-class mail has gone up by 50 per cent.
第三类邮件的邮资上涨了50%。
A: I want to send this package by first class mail.
A：我想用第一类邮件寄这个包裹。
Written materials are supposed to be sent by the more expensive first class mail.
书写的东西都作为收费较高的第一类邮件寄发。
They are supposed to be sent by the more expensive 'first class' mail.
它们应以更贵的“一类”邮件邮寄。
They are supposed to be sent by the more expensive 'first class' mail.
它们应以更贵的“一类”邮件邮寄。
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