He said Palestinians are waiting for the Americans to cancel that decision because it will be difficult to see the process restarting with this kind of action in place.

VOA: standard.2010.03.11

It's a very complicated situation because the kind of economic risks that we face are difficult for most people to understand.

一个很复杂的情况是,我们所面临的经济风险,很难被大众完全理解。

耶鲁公开课 - 金融市场课程节选

To actually apply this it helps to go to something called the normal approximation to the binomial, because it's kind of difficult to compute this formula.

在实际应用这些公式的时候,需要运用二项分布的正态近似定理,因为二项分布公式的值很难计算

耶鲁公开课 - 金融市场课程节选

She says it's no easy feat. "You have to kind of deliver so much of the story through your own written texts so it's difficult in that way because you have to get a character and a point across in 140 characters or less."

VOA: standard.2010.05.07

Very difficult problems, but in my judgement, all solvable if we generate the country in the kind of bipartizan political cooperation and political courage that will be necessary to fix them.

这些问题很不容易解决，但我认为,不是不能解决，只要我们,以这种两党制的合作形式治理国家,还要有治理它们的政治勇气。

普林斯顿公开课 - 国际座谈会课程节选

One of the things that a lot of observers have been concerned about is the fact that there could be a change in tactics away from the kind of spectacular and very difficult operations to conduct to operations that could be launched in far greater numbers and might have less individual impact but which in the aggregate could sow a great deal of terror.

VOA: standard.2010.05.05