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1、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。

2、例句如下：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。

3、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。

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