by a hair

详细解释:差一点儿

例句：

Even in closely contested elections, most of the pollsters have called the winners, often by margins close to vote tally. And the pollsters who missed were off by a hair.即使在胜负极为接近的选举当中，多数民意测验人员都测出了胜利者。胜负差距往往与点票结果接近。测验失误的人也所差微乎其微。