Kevin was amazed how John explained the usually very difficult math homework and made it look so easy.

凯文惊讶于约翰如何把通常很难的数学作业解释得如此简单。

youdao

So how do we approach those difficult problems?

因此，我们如何着手处理这些困难问题呢？

youdao

But missile attacks on ships are rare, so it is difficult to know just how safe a ship really is-especially if an attacker launches a dozen or so missiles at once.

但舰船受到导弹攻击的案例非常少，因此很难判断一条战舰躲过导弹攻击的劫数有多大，特别是在攻击者一次发射十多枚导弹的情况下。

youdao

So,just being able to pick one of those up will help our visitors understand how difficult portability was about thirty years ago."

VOA: special.2011.02.15

The question is not so much how we control what happens to us but what do we do when we were faced difficult circumstances, and how we can make spiritual meaning even when difficult things happen to us.

问题不是我们能够掌控多少,而是当我们面对困境,能做些什么，我们怎样体现灵性的意义,即便我们面临困境。

普林斯顿公开课 - 人性课程节选

Now the question is "how does it expand" and "why is it so difficult for us to understand, accept, assimilate and live according to the fact that we can make a difference, if we understand that what we need to understand is how change happens.

问题是“它如何扩大“,以及为什么我们难以理解，我们能够做出改变这个事实,并接受，被同化以及据此生活，如果我们能了解我们需要理解的,是改变如何发生。

哈佛公开课 - 幸福课课程节选

Should that happen, they may look back wistfully at their time in the Big Easy, wondering how things got so difficult.

ECONOMIST: City politics

So, how difficult can it be to devote the same time and education on the issue of domestic violence?

FORBES: Global Terrorism And The World Conference Of Women In Washington, D.C.

It means you should take these games with a grain of salt - particularly areas where states can do things that aren't so transparent like around the cut scores for their tests, the composition of the tests, how difficult they are and so forth.

NPR: Reauthorizing No Child Left Behind: Schools React