In the Tianshuihai area, small pingos, unsorted circles, sand wedges and polygons, and other periglacial phenomena were identified.
该地区发现大量小型冻胀丘、石环等冰缘现象的存。
,多角容词: polygonal
；正多角；凸面多角In the Tianshuihai area, small pingos, unsorted circles, sand wedges and polygons, and other periglacial phenomena were identified.
该地区发现大量小型冻胀丘、石环等冰缘现象的存。
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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