Move selection left 将被选中的关键字左移一列，好增大一个等级。 Sort every keyword at same level as selection 将与当前被选中关键字同等级的各关键字进行排序。
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While holding down the mouse button, a user can manipulate the arrow keys to move the selection up, down, left, or right-one pixel at a time.
维持鼠标按键按下的状态下，用户可以操控箭头键将所选对象向上、下、左或右每次移动1个像素。
Using the Direct Selection Tool (a) over our brand new rounded rectangle, grab the points of the top left corner and move them to the right (you can use the cursors for an accurate move).
用直接选择工具在我们创建的新的圆角矩形，向右拖动左上角的点(你可以用光标准确的拖动)。
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