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

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

It's a difficult problem that not everyone is smart -they vary in their ability -so we try to make a world in which it's pretty safe for the small investor who's not paying attention.

不是所有人都是聪明人,这是个难题,大家能力不同,所以我们试图营造一个环境,一个让小投资者感到安全的环境,而无需忧心忡忡

耶鲁公开课 - 金融市场课程节选

Some women find it difficult or embarrassing to request a prescription from their doctors or to get the medication in time.

VOA: standard.2010.03.22

The phenomena is known as "emotional contagion, where if you're facing somebody, for instance, and they're they look at you in a face of absolute rage, it is very difficult to just sit there without your own face molding in accord to their own.

这种现象就是情绪感染，例如，你看着某人，他们怒气冲冲看着你，你很难只是坐在那里,不去回应他们的愤怒。

耶鲁公开课 - 心理学导论课程节选

He explains that despite their differences the plane crash in Russia is "a great loss for the nation, which will be difficult to overcome."

VOA: standard.2010.04.10

"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

"Going into 2010, it is going to be more difficult to get controversial legislation done, because Democrats in the House and in the Senate are looking at their own re-elections,"

VOA: standard.2009.12.15