名词
中文翻译：遗憾信
同义词：
['apologetic letter', 'letter of apology', 'letter of contrition']
例句：
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1. I regret to inform you that your request has been denied.
我遗憾地通知你，你的请求已被拒绝。
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2. The sender apologizes for the delay in the delivery of the letter of regret.
发件人为延迟交付悔过信道歉。
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3. The letter of regret was addressed to the president of the company.
悔过信是寄给公司的总裁的。