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。
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。
It might be a good idea to mail the letter first class.
通过一级邮递寄这封信也许是个好主意。
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。
Starting today it will cost you more to mail that first class letter.
从今天开始，第一类邮寄信件的邮寄费将要上涨。
Starting today it will cost you more to mail that first class letter.
从今天开始，第一类邮寄信件的邮寄费将要上涨。
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