还可以对你所查看的页面进行缩放，测量页面中两点间的距离。
Also you can Zoom the page you are viewing and measure distances between any two points on the page.
引进了两点间的距离，但它不是实数，是B空间中的点。
The distance between two points has been introduced, which is not a real number but only a point in B-spa(?) e.
度量为坐标系定义的几何函数，有了它，坐标系上任意两点间的距离可以通过点的坐标来计算。
A geometric function defined for a coordinate system such that the distance between any two points in that system may be determined from their coordinates.
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