- But sometimes the formations in a cave stop growing altogether.
但有时洞穴内的这些活动会完全停止 - These flooded caves in Mexico have remained virtually unchanged for thousands of years.
墨西哥的这些水洞 几千年来几乎保持不变 - Since the last Ice Age they've become cut off from the outside world.
自从上一个冰川期以来 它们便已和外界隔绝 - Yet their impact on life on the surface has been huge.
然而它们对地面上的生物 却有着极其深远的影响 - 500 years ago they supported one of the world's great civilisations
500年前 它们维系着 一个世界上最伟大的文明 - the Maya.
玛雅 - Mexico's Yucatan Peninsula has no rivers, lakes or streams
墨西哥的尤卡坦半岛 没有河流、湖泊和小溪
Yet their impact on life on the surface has been huge. 然而它们对地面上的生物 却有着极其深远的影响
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