伸手不见五指: so dark that you can't see your hand in front of you; pitch dark
漆黑一团: 1.(非常黑暗) pitch-dark; altogether pitch black; as black as pitch; dark and dirty; complete darkness 短语和例子把 ... 说得漆黑一团 paint a dark picture of2.(一无所知) be entirely ignorant of; be in the dark;