a day off 与
one day off的区别在于:
a day off的重点是off,强调在某一天会暂时离开;one day off的重点是one,强调会离开一天,而不是two days off或者several days off。
例句如下:
1、The professor is now a day off and will be back soon tomorrow.
教书就离开一天,明天就回来了。
2、She was so hard-working that she just had one day off when she gave birth to a baby.
她工作太努力了,即使生孩子他也只是离开了一天。