In the Tianshuihai area, small pingos, unsorted circles, sand wedges and polygons, and other periglacial phenomena were identified.
该地区发现大量小型冻胀丘、石环
冰缘现
存
。
simplifying polygons
In the Tianshuihai area, small pingos, unsorted circles, sand wedges and polygons, and other periglacial phenomena were identified.
该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.
四个相
平行四
形;不是直角
平行四
形。
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