这个分类允许用户轻松地选择或取消这些组中的所有参与者。
This categorization allows users to easily select or deselect all the invitees in those groups.
当选择或取消选择一个元素时，它所有的子节点都设置为相同的状态，这可以用来快速选择整个类别甚至整个树。
When an element is selected or deselected, all of its child nodes are set to the same state, which allows for quick selection of entire categories or even the entire tree. For the exercise.
这个小部件是在表的左上角上的复选框，它允许您选择或取消选择该列上的所有复选框。
This widget was the checkbox in the top left corner of tables that allowed you to select/deselect all the checkboxes in that column.
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