It is to be regretted that

It is much to be regretted that you can't join us in the trip.

令人遗憾的是你不能和我们一起去旅游。

It is to be regretted that so many young people leave school without qualifications.

遗憾的是那么多年轻人不能毕业。

It is to be regretted that he should have committed this foolish act.

他做出这样的愚行来真是遗憾。

It is much to be regretted that this advise, subsequently repeated, was not taken.

非常遗憾的是，后来再度提出的这项建议没有被接受。

It is to be regretted that I can't help you.

可惜我帮不了你的忙.

However, it is to be regretted that by now Chinese researches on Black Water have been almost in silence.

但遗憾的是，迄今为止国内涉及《黑水》的研究还相对薄弱。

It is to be regretted that he should have died so young.

他竟然这麽年轻就死了，实在令人惋惜。

But it is to be regretted that the problem hasn't called up the jurisprudence circles'and the economics circles'wide concern and enough attention in China.

但遗憾的是，它没有引起我国法学界和经济学界的广泛关注和足够重视。