The lower portion of the definition, bounded by document ... end, is used by the GDB command interpreter to display help text associated with the cls command when you type help cls.
此定义的下半部分（在document ...end 所界定的范围内）由GDB命令解释器使用，用于在您键入helpcls时显示与 cls 命令关联的文本。
Click on any menu item, toolbar or tool palette button, to display help about that item.
单击任意菜单项目、工具栏或工具板按钮来显示相关帮助。
Click on any menu item, toolbar or tool palette button, to display help about that item.
单击任意菜单项目、工具栏或工具板按钮来显示相关帮助。
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