【单词社交网络】S2-14《美丽中国》
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subterranean marvels
http://t1.g.hjfile.cn/listen/201302/201302071014486981123.mp3So far, only a fraction of China's caves have been thoroughly prospected and caves are constantly discovering new subterranean marvels, many of which are subsequently developed into commercial show caves.迄今为止被探索发掘的中国洞穴是中国大地上的九牛一毛，而被发掘的洞穴不断为我们展现地底奇观，许多在后来被开发成了观光洞穴。
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