他可以使用工具栏中的向左或向右箭头来访问演示的不同页面。
He can use the the left and right arrows in the toolbar to navigate through the pages of the presentation.
下一个箭头，从包含4的单元格开始，也指向左上侧，但是值没有变。
The next arrow, from the cell containing a 4, also points up and to the left, but the value doesn't change.
如果单击箭头，则图像就会向左或向右移动，并被一组新的图像取代。
If you click the arrows, the images shift to the left or right and are replaced with a new set of images.
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