This is an idiom easily grasped by users and is effective because it not only provides a functional control but also indicates the state of that control. This idiom is probably best used in programs with fairly simple menu structures.

• 这是一种用户能很快掌握的习惯用法，可能最适合用在菜单结构简单的程序中，它们常用于指示和切换程序界面特性。