A giant cave column swagged in flowstone towers over explorers swimming through the depths of Hang Ken, one of 20 new caves discovered last year in Vietnam.

洞穴中一根垂挂着流石的巨大石柱俯瞰着游向Hang Ken洞深处的探险者们，这个洞穴是去年在越南新发现的20个洞穴之一。

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This paper mainly expounds a new method for predicting the distribution, especially the elevations, of karst caves.

本文主要论述预测岩溶洞穴分布位置和高程的新方法。

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Managers of the showpiece Dan yr Ogof Caves in the Swansea Valley said the new scheme will be the "nail in the coffin" for many private operators.

BBC: Museums launch free entry

Now, however, the caves have discovered a new lease of life as environmental edutainment.

ECONOMIST: Kentucky��s caves

The proposals include the creation of a new visitor centre, building on the Robin Hood legend and improving access to the network of caves below.

BBC: Nottingham Castle's Robin Hood revamp plans submitted