为了添加一个层，您可以点击视图中的绿色加号按钮(如果您尚未向图表添加任何层的话，那么您还可以使用点击这里以向图表添加一个新层超链接)。

To add a layer, click the green plus button in the view. (If you have not already added any layers to the diagram, you can also use the click here to add a new layer to the diagram hyperlink.)

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当互联网兴起，设计师用按钮与超链接建立起的交互界面使得它能够为每个人所用。

When the Internet happened, they created interfaces with buttons and hyperlinks that enabled us all to use it.

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