In the Tianshuihai area, small pingos, unsorted circles, sand wedges and polygons, and other periglacial phenomena were identified.
地区发现大量小型冻胀丘、石环
冰缘现
存。
复数形式）simplifying polygons
In the Tianshuihai area, small pingos, unsorted circles, sand wedges and polygons, and other periglacial phenomena were identified.
地区发现大量小型冻胀丘、石环冰缘现存。
A prismatoid having polygons with the same number of sides as bases, and faces that are parallelograms or trapezoids.
四个边相平行四边形；不是直
边平行四边形。
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