4keep documents and papermail 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。
2
Well, ever since email became popular, people have used snail mail to talk about papermail, 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。
3
Limit your communications. Our lives these days are filled with a vast flow of communications: email, im, cell phones, papermail, Skype, Twitter, forums, and more.