Most people wouldn't ever mail a letter or get a letter--too expensive, not to count only the paper and everything was expensive.

大多数人可能从未寄过信,或是收过信，因为太贵了，不单单是纸贵,什么东西都贵。

耶鲁公开课 - 金融市场课程节选

They had a mail service, although it was for official use only.

建立了邮政系统，虽然只供官方使用。

耶鲁公开课 - 新约课程节选