面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。
形,角形
形；正角形
形；面角形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.
四个相等
行四形；不是直角等行四形。
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