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。
But once you're done, you may want to copy the class file to another directory or zip it up to send it to someone else by E-mail.
但是一旦上述工作结束，您还要把类文件拷贝到另一个目录中，或进行压缩，通过邮件发送给其他人。
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。
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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