I was sure she knew the answer but for some reason she hung back.

我敢保证她知道答案，但不知为什么她不敢说出来。

《牛津词典》

It was clear that the elephants could, at any time, break away from their ropes but for some reason, they did not.

很明显，大象在任何时候都可以挣脱绳索，但出于某种原因，它们没有这样做。

youdao

But for some people, that isn't enough.

但对某些人来说这些还不够。

youdao

But for some elders who live by themselves, the holidays can be an especially lonely time.

VOA: standard.2009.12.24

It's a freedom that, of course, Parliament had pushed for, but now that they've got it there is some misgiving.

当然，这是一种议会推崇的自由，但是现在他们得到的只是疑虑。

耶鲁公开课 - 弥尔顿课程节选

but it's important to get some peace and quiet sometimes, so I do go to Central Park for that.

但有时候得到一些平静和安宁也很重要，这种时候我就会去中央公园。

街上的售票员 - SpeakingMax英语口语达人

The cow seemed to be trying to go downhill but for some reason it could not.

NPR: Excerpt: 'Lost in Uttar Pradesh'

Drowsy drivers often make it safely to their destination, but for some, the consequences are devastating.

WSJ: Drowsy driving remains an elusive highway dilemma

But for some women from conservative families, there is no question of getting a job.

BBC: Saudi women walk out of a shopping mall in Riyadh