'Snail mail' is the traditional letter delivering service in which you have a postman and a post box.
It's different from email or electronic mail, when the message sent on the computer travels quickly to its destination.
A. I'm sending my auntie Marge this lovely birthday card via snail mail. She lives in Japan.
B. I much prefer using email these days. All I get by snail mail are these marketing leaflets!
The verb 'to post' and the noun 'post' have also gained new meanings in the internet age.
If you write an opinion on a social media website - you 'post' a comment.
Before, you had to go to the post office to… post your letters. Here are some more examples of this new meaning of 'post'.
A. This website's all about how trendy it is to wear fur. I don't like it at all. I think I'll post a comment!
B. Mary ls first has a blog about food and she publishes new posts every day.
3. Hard copy
'Hard copy' is what we call the paper version of a document you write on your computer or of a digital picture you take.
hard copy是纸制文件，而soft copy是扫描的。
A. I'll give you a hard copy of my report, Mary. You can read it on the bus, on your way home.
B. I have a digital copy of my wedding picture as a screensaver at work but I much prefer my hard copy in a frame. It's much nicer.