against time 争分夺秒；抢时间;

all the time（在某段时间内）一直，始终

at all times 总是；随时；永远

Farm work is seasonal, so we must race against time.

农活有季节性，必须抢时间。

I can't be doing with people who complain all the time.

我无法忍受那些整天发牢骚的人。

Doctor Liu is on call at all times.

不论什么时候刘医生随叫随到。