regrettably, we cannot 令人遗憾的是，我们不能
regrettably, he failed 遗憾的是，他失败了
regrettably, the event was canceled 遗憾的是，活动被取消
unfortunately 遗憾地
sadly 可惜地
A: Will you attend the ceremony?
A：你会参加仪式吗？
B: Regrettably, I have another appointment.
B：遗憾的是，我有另一个约会。
1) 表示遗憾地
2) 用于书面或正式语境
3) 引出不幸或令人失望的事实
4) 可替代 unfortunately 或 sadly
1. 遗憾地，令人惋惜地
2. 可用于表达抱歉或不幸的情况
adverb
1. Used to express that something is unfortunate or to be regretted.
Synonym: unfortunately, sadly