请注意，编辑器会在已经映射的元素旁边显示箭头图标。
Notice that that editor shows arrow ICONS next to the elements that have been mapped.
如果隐藏按钮是激活的，选择这个选项显示箭头记号打开隐藏按钮。
Select this option to display arrows on the hide buttons, if the hide button is enabled.
图1中显示的箭头的相对宽度表示这三个来源的相对重要程度，这取决于系统的新颖度。
The relative width of the arrows shown in Figure 1 indicates the relative emphasis of these three sources, depending on the novelty of the system.
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