例如，可以确定两个图形之间的距离，执行空间集合操作，如合并或交叉图形，获取一个 linestring 的长度。

For example, you can determine distances between two geometries, perform spatial set operations like unioning or intersecting geometries, and retrieving the length of a linestring.

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然而许多情形下，合并会关闭一所好学校，迫使它的学生搭乘长距离公共汽车到邻镇上学。

But in many cases, a merger will lead a good school to close, forcing its pupils to take long bus journeys to the next town.

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那块石头本身也距离它的坟墓很远，而且明显是被从墓地里移走，然后在大约1000年后，再被合并到一座罗马时代的建筑的墙体里。

The stone itself was long way from its tomb and had apparently been removed from the grave and then incorporated into the wall of a Roman-era building, more than a thousand years later.

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