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1.The expanding cone is a natural formation that can be found in many areas of the world.
膨胀锥是一种自然形成的地貌，可以在世界上的许多地方找到。
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2.The expanding cone is often used as a reference point for measuring distances.
膨胀锥常被用作测量距离的参考点。
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3. The expanding cone is a fascinating example of how nature can create complex shapes and structures.
膨胀锥是大自然如何创造出复杂形状和结构的迷人例子。