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。
Now your new function will show in the main window.
现在这个新函数将出现在主窗口中。
The first two lines of this method do something you would expect to happen at the start of a GUI program: they create and show a main window.
该方法的前两行的用途在GUI程序的开头部分很常见：它们创建和显示主窗口。
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