It is situated in a clear cave formation where water suddenly appears and disappears are very fascinating natural phenomena.
它坐落在一个清澈的洞穴里，在那里水突然出现和消失是非常迷人的自然现象。
Cave formation
原声例句
雅思口语高分榜样
空中英语教室：高级版——彭蒙惠英语
There were so many interesting cave formations.
有很多有趣的洞穴构造。
英语百科
Speleothem
（重定向自Cave formation）
A speleothem (/ˈspiːliːəθɛm/; Greek: "cave deposit"), commonly known as a cave formation, is a secondary mineral deposit formed in a cave. Speleothems typically form in limestone or dolostone solutional caves.
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