No doubt many will regard these as harsh words, but regrettably they are true.

的确很多人会觉得这些话刺耳，可惜它们却是事实。

《柯林斯英汉双解大词典》

There are other companies in the pipeline, but regrettably we can't talk about those yet.

还有些其他公司尚在联络中，但是很遗憾我们还不能透露他们。

youdao

But regrettably, the original authors of Order and Contract weren't farsighted enough to base their design on interfaces.

但令人遗憾的是，Order和Contract的最初作者没有足够的远见来把它们的设计建立在接口上。

youdao

Regrettably,this one-sided report, claiming to represent international law but in fact perverting it to serve a political agenda, can only weaken the standing of international law in future conflicts,".

VOA: standard.2009.09.29

Secretary Clinton said Wednesday that Bosworth had been prepared to travel to North Korea "at a moment's notice" during his first mission to the region last week, but said he regrettably did not get an invitation to do so.

VOA: standard.2009.03.12

Coverage of the new gTLD program is always welcomed but regrettably there are still misconceptions and unfounded statements of fear, even by trademark experts who are experienced in the space.

FORBES: Cybersquatters Get Rich New Territories With Generic Domains

But regrettably, it happens over and over again.

WHITEHOUSE: Press Briefing

We had arrangements in place to meet Ed less than twenty four hours later to discuss our plans but, regrettably, someone involved in the process chose to leak the news to the Daily Mail.

BBC: Today