A: Did Roll win the race?
B: Yeah, he did. But he only won it by a hair's breadth.
A: But anyway, he won at last.
B: Yeah. To win is the most important thing.
a hair's breadth
A hair's breadth的意思是“一发之差”“极微小的距离”。它可以和介词by或者to搭配使用。By a hair's breadth是指“险些儿”“间不容发地”。To a hair's breadth是指“精确地”“一毫不差地”。
E.g. She was within a hair's breadth of winning.
E.g. After wandering around the forest for an hour thinking we were lost, it turned out that we were only a hair's breadth away from our campsite.
E.g. The seal is air-tight—there's not a hair's breadth between the door and the frame.
E.g. The situation was a hair's breadth away from being comical.
E.g. The town suffered heavy bombing, coming within a hair's breadth of being destroyed altogether.
E.g. After a long dispute, he at last made a concession to me.
E.g. She became at last an inevitable figure at all respectable entertainments.