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。
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。
I 'am happy to have the first communication with you by E-mail.
我是XX公司的XXX，很高兴第一次与您用邮件交流。
I 'am happy to have the first communication with you by E-mail.
我是XX公司的XXX，很高兴第一次与您用邮件交流。
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