Remember that you must change your arithmetic when the page is shown in Internet Explorer from right to left, such as by adjusting the position of the element by the offset of the origin.
请记住，当页面在 Internet Explorer 中从右到左显示时，必须修改算法，比如按照原点的偏移量调整元素的位置。
The physical coordinates of a point are the actual offset in pixels from the top left of the origin.
点的物理坐标是距离原点左上方的以像素为单位的实际偏移量。
The point at which the origin of the content view is offset from the origin of the scroll view.
是一个坐标点，这个坐标点是滚动视图中内容视图所在的坐标点。
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