在树中选择一个节点可以在编辑区中显示出代码或者相关内容。
Selecting a node within the tree pane displays the code or content associated with it in the editor pane.
杰克盯着车速表好久，上面显示出：55区73码，已超速。
Jack took a long look at his speedometer before slowing down: 73 in a 55 zone.
球棒的击球区会显示出阴影，让你可以对准了挥棒。
A shadow of the bat's impact zone is shown so you can line up your swing.
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