讲解文本：
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！
