The middle window is the mainFrame, where users can see and edit the content of slide.
中部窗口是mainFrame，用户可在此处查看和编辑幻灯片内容。
The middle window is the mainFrame that we use to show the editable content of your presentation.
中部窗口为mainFrame，用于显示演示中可编辑的内容。
The middle window is the mainFrame that we use to show the editable content of your presentation.
中部窗口为mainFrame，用于显示演示中可编辑的内容。
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