The lane was passable by daylight; without a guide one was liable to a broken leg at night on the boulders which lay scattered there since the receding ice had forgotten them aeons ago.

열심히 해보려고 노력해봤는데, 

liable하고 lay를 어떻게 해석해야 할 지 모르겠습니다 ㅜㅜ