Early identification of the disease may be difficult because many infected people do not show any immediate symptoms.

VOA: special.2010.01.04

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

Some people find that a psychologically difficult thing to accept, but I've believed that pretty much all my life, so I'm quite comfortable with it.

有些人会觉得心理上,很难接受这一点，但在我的人生中，我一直相信这一点，我也坦然接受这一点。

普林斯顿公开课 - 人性课程节选

However,this is more difficult because it is harder to control the diets of people and because they live longer than other animals.

VOA: special.2009.09.01

He says,"There are many things in Paul's letters very difficult to understand. And some people twist them to their own destruction as they do other kinds of scripture."

他说“保罗的书信里有很多,难以理解之处，而有些人曲解它们,这是自取沉沦，正如他们对待其他圣典一样“

耶鲁公开课 - 新约课程节选

We all know that some people do not seem as emotionally strong as others when life gets difficult.

VOA: special.2009.06.24

For most people, that's a difficult concept and-- I think I may have mentioned some of this before, but let me give this history.

这个概念对大多数人来说有些难,我记得我之前提及过其中一些,但还是让我来讲述一下它的历史

耶鲁公开课 - 金融市场课程节选

President Obama also spoke about the difficult time people in the Gulf area were going through as a result of the oil spill.

VOA: special.2010.06.18

And this is actually, in general, why it's sometimes difficult to teach or to tell stories because we constantly overestimate how much other people know.

概而论之，这就是为什么有时候我们很难能讲一个故事,因为我们总是认为别人什么都猜到了。

耶鲁公开课 - 心理学导论课程节选

America's third party at that time -- The People's Party -- had a difficult decision to make.

VOA: special.2010.07.01

That is a very difficult time for people in the Internet industry.

对于互联网行业来说,那是一段困难时期。

斯坦福公开课 - 百度CEO李彦宏演讲：全球最大搜索引擎的发展课程节选

But it was often difficult. To protect their towns,the settlers often had to employ people who were expert in the use of firearms.

VOA: special.2010.03.10

It also is a good lesson in how difficult it is, and we'll talk about this in a subsequent class, to actually measure what people eat.

同样这能很好的说明,实际评价人们的饮食有多困难,我们下节课会讨论这个话题

耶鲁公开课 - 关于食物的心理学、生物学和政治学课程节选

This has made it even more difficult for many people to rebuild their lives and communities.

VOA: special.2010.01.22

People on Wall Street found that difficult to say -Federal National Mortgage Corporation- so they nicknamed it Fannie Mae; it sounds like a woman's name.

华尔街的人觉得这名字很拗口,联邦,国民,抵押,贷款,协会,所以给它起了个昵称,房利美,这听起来像个女性名字

耶鲁公开课 - 金融市场课程节选

Yet many people today cannot see the Maze District because it is so difficult to reach.

VOA: special.2009.04.15

That apparently is a difficult question that most people didn't know in 1974.

这显然是个难题,当时没有什么人知道

耶鲁公开课 - 金融市场课程节选

The people spoke a difficult language that had never been written down.

VOA: special.2010.01.17

The idea was that it was difficult to sell people on insurance.

这是因为当时将寿险卖出去是很困难的

耶鲁公开课 - 金融市场课程节选

The people of the South faced a difficult future.

VOA: special.2010.01.14

How many people found it difficult to do?

有多少人觉得这个很难做

耶鲁公开课 - 关于食物的心理学、生物学和政治学课程节选

Some people say roses are difficult to grow.

VOA: special.2010.06.15

Traditionally, they used to teach people relaxation exercises but that proves too difficult.

这些方法通常被用来帮助人们做放松练习,但效果不佳。

耶鲁公开课 - 心理学导论课程节选

But it became increasingly difficult to continue the crackdown as the protests grew to hundreds of thousands of people.

VOA: standard.2009.11.17

And people who are giving have endured this very difficult 12 month period and so giving is down,"

VOA: standard.2009.12.16

Yet,health clinics can be difficult to get to in rural areas and people are more likely to go to a traditional healer first.

VOA: standard.2009.04.25

And it will be very difficult to convince the people to turn out,to show up."

VOA: standard.2009.10.25

"We have not shied away from raising the difficult problems that exist and stand in the way of the people of Africa realizing their potential.

VOA: standard.2009.08.16

"The problem with that body of research is that it's difficult to interpret because obviously people with existing mental health problems use cigarettes to self-medicate."

VOA: standard.2010.06.15

That means poor people find it difficult to buy healthful food.

VOA: standard.2010.07.02