— used to say that two people, groups, or things are too widely separated or different from each other to ever be brought together, made to agree, etc.（分歧、差异等）不可沟通的，无法弥合的
He says that there is an unbridgeable gulf/gap between the rich and the poor in this country.他说在这个国家穷人与富人之间有一道难以逾越的鸿沟。