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.
按下鼠标左键不松开，然后拖动鼠标扫过所要选定的文本。
Click and hold your left mouse button and drag your mouse across the text.
按下鼠标左键不松开，然后拖动鼠标扫过所要选定的文本。
Click and hold your left mouse button and drag your mouse across the text.
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