by a hair

just barely; by a very small distance

仅仅，微小的差距

They're just about to close the gates! It looks like we made the flight by a hair.

他们马上就要关门了!我们差一点就赶不上飞机了。

The race was neck and neck till the very end, but Sally won it by a hair.

比赛一直到最后都分不出胜负，但是最终萨莉以微弱优势获胜了。

The bullet missed him by a hair 's breadth.

枪弹擦身而过，差点儿打中他了。