I'm sorry I haven't written to you for so long.

真抱歉，我这么长时间未给你写信了。

《牛津词典》

I found it a strain having to concentrate for so long.

我觉得这么长时间全神贯注挺累的。

《牛津词典》

It's disgraceful that they have detained him for so long.

真是可耻，他们扣押了他这么久。

《柯林斯英汉双解大词典》

They say their findings offer one reason why the custom of cursing may have continued for so long.

VOA: special.2009.08.18

because the government's expenditures are only going to keep the economy afloat for so long.

因为政府的开支就是要保持经济的长期运转。

担忧未来 - SpeakingMax英语口语达人

So it took a long time for the twenty books that we have to get settled on. And we'll talk about how that actually happened,also,still.

所以很长一段时间之后那27本书,才最终被确定下来，我们会谈及,那是如何实现的。

耶鲁公开课 - 新约课程节选

And without landmines under them, Kinmen's fine-sand beaches would not have remained undeveloped for so long.

BBC: Overcoming 40 years of solitude on Kinmen Island

Some say gold-related shares, which have been unloved for so long, now look attractive.

WSJ: Rising Stock Prices Flash a Warning��Selloff Ahead?

Almost nothing else about the global economy has stayed so constant for so long.

NPR: After 200 Years, U.S. Remains King of Cotton