It was Lechuguilla's gypsum crystals 龙舌兰洞的石膏结晶群
It mixes with oxygen and the water, 与水中的氧发生化合反应
that one would not expect it to contain any life whatsoever. 不管什么生物似乎都不可能在那里生存
External gills help it to breathe in water that is particularly low in oxygen. 外生的鳃帮助它们 在极度缺氧的水中呼吸
It takes thousands of generations for eyes to be lost, 眼睛的退化需要经历数千代的演变
making it a particularly difficult place for animals to live. 对动物而言是极为困难的生境