At this point we can see that the file is selected by the dotted box. We can push the clipping dotted box, or we can custom draw the clipping dotted box.
Click "Selection Adjustment" to set the page number unit and page margins, for example, set the unit to "cm". This will adjust the page margins in centimeters.
点击“页面范围”可以选择应用裁剪的页面范围，例如设置为应用“全部页面”。这样全部页面就会被裁剪为统一形状了。
怎么样，这个功能是不是很智能呢？
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