He set the frog down and took out after that man but he never caught him.

VOA: special.2009.08.29

We've used the fundamental equations that are hiding down here, out of sight but never out of mind.

我们利用了,写在这里的基本方程，虽然没有注意它但却时时刻刻记者它。

麻省理工公开课 - 热力学与动力学课程节选

but unfortunately the days when I could go were never available. It didn't work out.

但可惜的是，我没时间去。没能实现这个心愿。

蒂姆伯顿最棒 - SpeakingMax英语口语达人

Unfortunately, I've never taken a course in it, but I've started reading it lately out of just my broad intellectual interest.

遗憾的是,我从未上过有机化学课,但我最近开始读一些相关的书,这是我广泛爱好中的一种

耶鲁公开课 - 金融市场课程节选

So, hunger sets in and it becomes extremely sad and tragic, and attempts to break out simply don't work; but, it had its light moments, and I can never resist those.

饥饿来临,一切都变得如此悲惨,而尝试逃跑只是徒劳,但这其中也有些趣事发生,我对这些逸事总是没抵抗力

耶鲁公开课 - 1871年后的法国课程节选