They're used for posting letters.

它们是用来寄信的。

youdao

You could add functionality for posting comments on blog posts.

还应该添加在 blog post 上张贴评论的功能。

youdao

This main screen shows status messages, both your own and those of users that you track, and has a box for posting new messages.

这个主界面显示您自己和您跟踪的那些用户的状态消息，其中有一个用于发布新消息的文本框。

youdao

A Thai blogger this month received a royal pardon after serving one year in jail for posting photos deemed offensive on the Internet.

VOA: standard.2010.07.06

We're also posting a practice exam for you to take, so after you're completely done your studying, it's good to have everything done before you take the practice exam, and then sit down just with this sheet here and your calculator, and ideally a timer, and make sure you can do the practice exam in the allotted amount of time.

我们还将给出一份模拟试题，因此在你完全复习好之后，最好先复习完,再做这份模拟试题，坐下来,只拿出这张表与计算器，最好还有个计时器，确保自己完成模拟题,在规定的时间内。

麻省理工公开课 - 化学原理课程节选

An Australian high school recently suspended students for posting hateful comments about a teacher on Facebook.

VOA: standard.2010.03.30

It's one thing to be arrested for posting a photo that shows you breaking the law.

CNN: When oversharing online can get you arrested

Jeff McCord emailed me later Saturday to thank me for posting about his project.

FORBES: How An Eleventh Hour Push From Obsidian Helped Kickstart 'Sword Of Fargoal 2' Over The Finish Line

In an age of fast, provocative blogging, should Marie Claire admit fault for posting an insensitive piece?

FORBES: Marie Claire's Maura Kelly Fires Off 'Fattie' Blog