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k a leg! 祝你好运!
head over heels in love 爱得神魂颠倒
cold feet 沮丧;临阵退缩
off on the wrong foot 出师不利,起步便错
an arm and a leg 价格非常昂贵
6. have an affair with someone 与某人有一腿
timer 劈腿