当卷动方块位于最大值时，卷动方块会移至最右边或底部的位置。
When the scroll box is at the maximum value, the scroll box moves to the right-most or bottom position.
同样地，介于范围上下限中间的值会将卷动方块的前缘置于卷轴中间。
Similarly, a value halfway between the bottom and top of the range places the leading edge of the scroll box in the middle of the scroll bar.
除了按一下滑鼠来变更卷轴值之外，使用者也可将卷动方块拖曳至卷轴上的任何位置。
In addition to using mouse clicks to change the scroll bar value, a user can also drag the scroll box to any point along the bar.
除了按一下滑鼠来变更卷轴值之外，使用者也可将卷动方块拖曳至卷轴上的任何位置。
In addition to using mouse clicks to change the scroll bar value, a user can also drag the scroll box to any point along the bar.
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