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。
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.
按从左至右的顺序发牌，并摆成一行，不要相互重叠。
Deal cards one by one in a row from left to right, not overlapping.
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