Day

save a day的意思是“省了一天的时间”, save the day的意思则是“反败为胜,转危为安”。例如:

We saved a day by taking a plane there.我们乘飞机去那里,因而节省了一天的时间。

The team was behind, but at the last minute Tom saved the day with a touchdown.这支球队一直落后,然而在最后的时刻汤姆一次底线得分使球队反败为胜。

前者意思是“在白天”; 而后者意思是“按日计算”。例如:

We travelled by day and stayed at inns at night.我们白天旅行,晚上住在客栈。

In some countries, most of the workers get their pay by the day.在某些国家里,大部分工人是按日计酬的。

前者意思是“短促”; 而后者意思是“当时,当代”。例如:

It is nothing than a stuff of a day.这无非是昙花一现而已。

It was a twice-told tale of the day.这便是当时传诵一时的老话题。