创建带有指定键、文本和图像的新选项卡页，并将该选项卡页插入集合中的指定索引处。

Creates a new TAB page with the specified key, text, and image, and inserts it into the collection at the specified index.

youdao

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