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1·We won by a hair's breadth.

我们以些微之差赢了对手。《牛津词典》

2·The gang escaped the police by a hair's breadth.

歹徒在千钧一发间逃脱警方追捕。

3·Eg. He escaped death by a hair's breadth. If the other car had been going any faster, he would certainly have been killed.

他简直是死里逃生。要是那辆车开得再快一点，他肯定被撞死了。