;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、石环等冰缘现象
存在。
边形,
形
边形；
形边形；凸面形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、石环等冰缘现象存在。
A prismatoid having polygons with the same number of sides as bases, and faces that are parallelograms or trapezoids.
四个边相等平行四边形；不是直等边平行四边形。
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观点；若发现问题，欢迎向我们指
。
