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1·We regret to inform you that you are being furloughed indefinitely.

我们遗憾地通知你：你被无限期地停职了。《柯林斯英汉双解大词典》

2·We regret to inform you that your application has not been successful.

我们很遗憾地通知您，您的申请未通过。《牛津词典》

3·Before you get carried away with your little scene, Miss Wenzmore, I regret to have to tell you again that we are not planning to go into television.

在你被你的小场景冲昏头脑之前，温兹摩尔小姐，我很遗憾地再次告诉你，我们不打算进入电视行业。

4·I regret to advise you that the course is now full.

本课程已满额，特此通知。《牛津词典》

5·I regret to have made your acquaintance so late.

识荆恨晚。《新英汉大辞典》

6·I regret to tell you a bad news.

我很遗憾地告诉你一个坏消息。

7·Love meaning to begin regret to need

（只为记忆方便, 不求精确）: 爱情意谓开始所需的悔恨

8·I regret to tell you that I won't go with you.

我很遗憾的告诉你我不能和你一起去。

9·I regret to have to do this, but I have no way.

我很遗憾要这样做，但是我没办法。

10·We regret to inform you that we cannot help you.

我们很遗憾地通知您，我们无法帮助您。