The rocky outcrops of New Zealand's Poor Knight Islands are riddled with sea caves 新西兰坡·骑士岛的 岩礁下布满了海蚀洞
so most sea caves are created by the mechanical pounding of the waves. 所以大部分海洋洞窟 是在海浪的机械冲击下形成的
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
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
But water in caves doesn't only erode. 可是洞里的水不光只是侵蚀
These Bornean caves are among the biggest in the world 婆罗洲的这些洞窟是世界上最大的洞穴
Bats are not the only commuters in these Bornean caves. 蝙蝠并非婆罗洲洞窟中的唯一常客
Caves are one of the few habitats on Earth not directly powered by sunlight. 洞穴是地球上少数几种 不直接依赖阳光的生态环境之一
Most of the world's caves are found within it 世界上大部分洞穴内都存在石灰岩
Today caves remain the least explored places on Earth. 今天 洞穴仍是地球上 人类最少涉足的地方