坦的;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、石环等冰缘现象的存在。
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、石环等冰缘现象的存在。
A prismatoid having polygons with the same number of sides as bases, and faces that are parallelograms or trapezoids.
个边相等的
边形；不是直角的等边边形。
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