要按照距离进行查询，必须使用投影坐标系。
To query by distance, you must use a projected coordinate system.
每个地图投影都弯曲距离、面积、形状、方向或它们的组合。
Every map projection distorts distance, area, shape, direction, or some combination thereof.
每个地图投影都弯曲距离、面积、形状、方向或它们的组合。
Every map projection distorts distance, area, shape, direction, or some combination thereof.
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