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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。