For these fish the caves are a night time retreat, 对于这些鱼来说 洞穴是理想的过夜场所
There are other fish working to a different schedule. 这里还有其它 按照不同日程表生活的鱼
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
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
The cenotes are, in effect, gigantic fresh water wells. 沼穴于是成了巨大的淡水井
These flooded shafts are the region's only source of open fresh water. 这些水潭是整个地区 唯一的露天淡水资源
produce an infinite variety of forms, but all are created by the same process - 造就了千姿百态的溶洞地形 但它们的形成过程都是一样的
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
are the main ingredient of birds' nest soup 是燕窝羹的主要成分
and gram for gram are worth as much as silver. 每克燕窝的价值堪比白银