against the clock 争分夺秒地，抢在某一时刻之前

　　We are working against the clock to finish the report.

　　为了完成这一报告我们争分夺秒。

　　We can't wait, It's a race against the clock.

　　我们不能再等了，现在是一场争分夺秒的竞争。

　　疯狂练习吧！