A selection and ordering component that can move items between available and selected areas, and up and down in the selected area. Figure 2 shows an example.
—一个选择和排序组件，可以在可用区与选定区之间移动项目，还可以在选定区中上下移动项目。
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。
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