用户松开鼠标左键后，拖动操作即完成。
When the user releases the left mouse button, the drag operation is finished.
拖动过程中会显示透明图标来显示松开鼠标按钮时portlet的放置位置。
A translucent icon appears during the drag to show where the portlet is placed when the mouse button is released.
使用方法：拖曳软件右上角的“捕获”按钮到需捕获的位置后松开鼠标即可。
Towed use software fore: the "capture" button to take place after the capture of the mouse can be loosened.
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