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这是墨西哥那可银矿中的水晶洞穴,这里的水晶柱体有的长达十几米,是迄今为止人们所知的最大的水晶体。这个洞穴的发现纯属意外。当时矿工们正在
This is the crystal cave in the Mexican silver mine, where crystal columns are some ten meters long and are the largest crystals known to date. The discovery of this cave is purely unexpected. At that time miners are