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

You might have to hold the Shift key or something like that, but they're standard keys.

你可能要按住Shift键或什么键，但他们是标准键。

哈佛公开课 - 计算机科学课程节选