The cave angel fish feed on bacteria in the fast flowing water 洞穴天使鱼以急流中的细菌为食
keeping their grip with microscopic hooks on their fins. 它们用鳍上的小钩紧紧抓住岩壁
are possibly the most specialised creatures on Earth 可能是地球上最奇特的动物
for their daytime sanctuary on the ground. 以换取它们白天在陆地上的庇护
The flooded caverns can play tricks on you in other ways. 地下水洞还会以别的方式戏弄你
The Maya knew that their lives depended on this water, 玛雅人固然知道 它们的生活离不开这些水
so the Maya relied on the cenotes - the flooded entrances to the water-filled caves. 因此玛雅文化完全依赖于沼穴 ——地下水洞的入口
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
then the calcite is deposited on the floor of the cave 方解石就会在洞穴地面上沉积
We need lights to see what's going on, 我们必须有光才能看清前方的路