Figures 3 and 4 show more formally where additional plug-ins can display their contributed UI elements in the main window. The scope of these UI changes can be large or small.
图3和图4更为正式地展示了附加插件在主窗口中呈现的UI元素，这些 UI变化的范围可大可小。
Listing 1 shows the XUL that tells Firefox what chrome (that is, UI elements) to display.
清单1所示的XUL将通知Firefox显示哪些chrome(即ui元素)。
As the scroll Viewscrolls, reuse the UI elements to display content that has scrolled into view.
由于滚动视图，重用ui元素来显示可以滚动显示的内容。
As the scroll Viewscrolls, reuse the UI elements to display content that has scrolled into view.
由于滚动视图，重用ui元素来显示可以滚动显示的内容。
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