In the Tianshuihai area, small pingos, unsorted circles, sand wedges and polygons, and other periglacial phenomena were identified.

在地区发现大量小型冻胀丘、石环等缘现象的存在。

A prismatoid having polygons with the same number of sides as bases, and faces that are parallelograms or trapezoids.

个相等的平行；不是直角的等平行。