She thanked them for their support, and she spoke mostly of her strong religious beliefs which helped her through difficult times, including her battle with cancer.

VOA: special.2009.03.29

I realize I've given you some difficult mathematics, but--it's not that difficult actually-- but I kind of went through it quickly.

我发现我给了你们一些比较难的数学公式，不过，并不是想象的那么难-,我很快就把它们讲完了。

耶鲁公开课 - 金融市场课程节选

But before telling you about this let me sort of Go through some of the hypothesis that we have and That we are now testing about why the subject is Difficult and why these materials assembled what We have assembled them might be useful.

但是谈那之前我要说说,我们之前的一些假设,我们现在正在测试为什么这个学科很难,以及为什么我们整合这些资料是有用的,我们认为把它们整合起来或许有用。

麻省理工公开课 - 媒体、教育、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

They had made a difficult climb from the southeast, through recently opened Nepalese territory.

VOA: special.2010.06.30

Even today, it is difficult to walk or ride through the park.

VOA: special.2009.04.15

During an appearance on a national TV news show, she described herself as a private person who finds it's difficult to allow personal emotions to show through in her songs.

VOA: standard.2009.12.15

The 60-vote advantage is also important because it will make it far more difficult for Republicans to block passage of bills through a filibuster, in which senators tie up the floor in long speeches to prevent a vote.

VOA: standard.2009.06.30

"We have just come through what was one of the most difficult decades the middle class has ever faced a decade in which median income fell, and our economy lost about as many jobs as it gained,".

VOA: standard.2010.01.25

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