Keep the mouse button pressed for a moment, then drag the area into the text document. If the documents are not visible next to each other, first drag the mouse pointer to the destination document button.
如果需要显示选出的区域，请您把鼠标指针放到选中的区域，按下鼠标按钮，并按住鼠标等待一段时间，然后把区域移动到文本文档。