adj.一时冲动的,立即的,不加思索的;
例句:
He bought that house on the spur of the moment.
他一时冲动买了那套房子.
She started for Europe on the spur of the moment.
她一时兴起动身去欧洲.
I just take the bus on the spur of the moment.
我是一时兴起才跳上公车的.