by a nose 微小之差，差一点，以些微之差

【例句】
The horse won by a nose.
那匹马以微弱之势险胜。

Chirkpar rattled past him on the right to snatch the prize by a nose.
一匹名为切厄克帕的赛马从他右侧疾驰而过，以一鼻之差获胜。