by a hair
just barely; by a very small distance
僅僅，微小的差距
They're just about to close the gates! It looks like we made the flight by a hair.
他們馬上就要關門了！我們差一點就趕不上飛機了。
The race was neck and neck till the very end, but Sally won it by a hair.
比賽一直到最后都分不出勝負，但是最終薩莉以微弱優勢獲勝了。
The bullet missed him by a hair 's breadth.
槍彈擦身而過，差點兒打中他了。
