方法是使拖动操作完全活动起来，实时地显示整个源对象的移动。
The most visually rich method is to fully animate the drag operation, showing the entire source object moving in real time.
方法是使拖动操作完全活动起来，实时地显示整个源对象的移动。
The most visually rich method is to fully animate the drag operation, showing the entire source object moving in real time.
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