Army officials say the offensive against the militants in Waziristan has been successful with troops gaining control of key areas and killing more than 200 militants.

VOA: standard.2009.10.28

And most of these commands you don't actually need but this little caret symbol means control, so every keyboard these days has a control key so you hold that and hit X for instance to exit the program.

这里大多数命令你们都用不着,这个小插入符意味着控制，每个键盘都有一个控制键,譬如，当你敲入X时，就退出这个程序。

哈佛公开课 - 计算机科学课程节选

The reason it printed that is I accidentally had my finger on the control key, which said print the last thing you had.

这是正确显示的，原因是刚才,我不小心按住ctrl键了，也就是这会显示你最后写的东西。

麻省理工公开课 - 计算机科学及编程导论课程节选