In another scenario, it could be counter-productive to generate the linestring for each and every row with which the spatial overlap test shall be performed.

在另一种场景中，为将进行空间重叠测试的每一行生成linestring又可能产生完全不同的结果。

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When you look at the spatial query that we used before in this article, you will notice that a new geometry was constructed as parameter for the overlap test.

当看到我们在本文前面使用的空间查询时，您会注意到，为了重叠测试，一个新的几何图形被构造成参数。

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It is important that the test and training documents do not overlap, which could skew the results.

需要确保测试和训练文件没有重合，否则会造成结果不准确。

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But while the Institute ranks the car as a "top safety pick" based on its performance in front- and side-impact tests, it gave the 2012 Mercedes C-Class a "poor" grade in the new small-overlap test.

WSJ: New Safety Test Puts Car Buyers in a Quandary