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
冰缘现
的存在。
形；多性（polygon的复数形式）simplifying polygons
形化简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.
四个相的
行四
形；不是直角的行四形。
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