这是一个箭头图标，用于选择和取消选择图表中的点。
This is the arrow icon and is used to select and deselect points in the chart.
在页面顶部是 IBM 建议链接，在左侧是过滤器，您可以通过选择或取消选择任务、主题和文档类型来精炼文档列表。
There are IBM recommended links at the top of the page, plus filters on the left side that let you the refine the document list by selecting or deselecting tasks, topics, and document types.
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.
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