4keep documents and paper mail you receive and use the back side as quick note pads or scratch paper.

4保留下文件和你收到的书面信件，使用背面作为快速笔记薄或便条纸。

youdao

Well, ever since email became popular, people have used snail mail to talk about paper mail, because it is slower thane-mail.

对，邮局寄的信和电子邮件相比真是要慢多了。叫它“蜗牛信”倒也挺形象的。

youdao

Limit your communications. Our lives these days are filled with a vast flow of communications: email, im, cell phones, paper mail, Skype, Twitter, forums, and more.

控制你的通信我们的日常生活被各种各样的通讯方式所占据：e - mail、即时通信工具、手机、手写信件，skype, twitter，各式各样的论坛等等。

youdao

For example,here in the U.S., medical records are still mostly kept on paper, and most doctors still rely more on fax than e-mail.

VOA: standard.2010.02.24

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

Newspapers are full of stories about how email, online bill-paying and other advances have rendered paper mail obsolete.

FORBES: To Avoid Collapse The Post Office Should Deliver Health Care And Other Services

It is a new foundational aspect to business itself, on par with the need for telephones for your employees it would simply not make sense to limit phone usage to only some employees and require others use face-to-face or paper mail to interact.

FORBES: Shining The Limelight On Social Business Services

Wantful then sends an artfully-designed small booklet wrapped in Japanese-style rice paper in the mail, which looks almost like a wedding invitation.

FORBES: This Black Friday, Wantful Says Forget The Mall And Forget Gift Cards