In political terms, President Obama may soon find himself between a rock and a hard place when it comes to the future of U.S.

VOA: standard.2009.09.28

Many values that I had a hard time accepting I came to terms with.

那些我曾经很难接受的价值观,我渐渐地学会接受它们。

普林斯顿公开课 - 人性课程节选

It's very hard to see how you explain that in physicalist terms.

都很难运用物理主义术语加以解释

耶鲁公开课 - 死亡课程节选

"In terms of access to Iranians, particularly that generation of Iranians in their 30s, is very hard to get to, and this is,in many ways, a win for the U.S.."

VOA: standard.2010.07.13

That's the question we're going to try and address. If we can do this, this is good, because first of all, it removes any questions about what machine I'm running on, it's talking about fundamentally, how hard is this problem, and the second thing is, it is going to do it specifically in terms of the input. Which is one of the things that I was worried about.

这是一个我们接下来要去,尝试和解决的问题，如果我们能做到的话会很不错，因为首先，它解决了结果可能和我,运行的计算机有关系的问题，因为这从根本了告诉了，我们这个问题的复杂度，第二件事情,就是这种方法可以依据输入的大小来计算,而这正是我最担心的地方。

麻省理工公开课 - 计算机科学及编程导论课程节选