- 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 - 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 - Food is often in short supply
食物总是很紧缺 - and troglodytes like the crab
像螃蟹这样的穴居动物 - 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 salamander might not encounter food for several months,
童态河溪螈可能 已有几个月没有吃东西了
Food is often in short supply 食物总是很紧缺
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