In the Tianshuihai area, small pingos, unsorted circles, sand wedges and polygons, and other periglacial phenomena were identified.
在该地区发现大量小型冻胀丘、石环等冰缘现
的存在。
；多边性（polygon的
式）simplifying polygons
化简In the Tianshuihai area, small pingos, unsorted circles, sand wedges and polygons, and other periglacial phenomena were identified.
在该地区发现大量小型冻胀丘、石环等冰缘现的存在。
A prismatoid having polygons with the same number of sides as bases, and faces that are parallelograms or trapezoids.
四个边相等的平行四边；不是直角的等边平行四边。
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