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》

We hadn't heard from him for so long, we'd given him up for dead.

我们这么长时间没有他的音信，都以为他死了。

《牛津词典》

He says there has never been a richer time for so many musicians and so many kinds of new music.

VOA: special.2010.07.19

I knew you in this dark: for so you frowned Yesterday through me as you jabbed and killed.

在黑暗中我认出了你,刺戮屠杀我的时候，你和昨天一样皱着眉。

耶鲁公开课 - 现代诗歌课程节选

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

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

And why would Assange hold onto the documents for so long before publishing them?

FORBES: Is Bank Of America WikiLeaks' Next Target?