have to survive on whatever washes into the cave from outside. 必须得吃任何从外边冲进洞内的东西
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
And the Belizean white crab is another creature that is unique to just one cave system. 而伯利兹白蟹是另一个 洞穴生态系统中的特有物种
There may well be less than a hundred Texas cave salamanders in the wild. 世界上可能只有不到100只 野生洞栖童态河溪螈
for they live only in cave waterfalls. 因为它们只生活在洞穴瀑布中
The entire population of these cave angel fish 世界上所有的洞穴天使鱼
Small wonder then that there are other cave dwellers that stay put. 难怪其它洞穴生物 要终生居住在洞穴中
This is the price that these cave commuters must pay 这是洞栖动物必须付出的代价