Freud's--Freud was very focused on the family life of the people he interacted with, which is rather upper class Europeans, and these sort of questions would have been difficult for Freud to answer.

弗洛伊德非常关注,与他接触之人的家庭生活，也就是一些欧洲的贵族们，对于这类问题,相信弗洛伊德本人也很难作答。

耶鲁公开课 - 心理学导论课程节选

because you know, economically it's been a bit difficult.

因为经济方面有点棘手。

英国的首相们 - SpeakingMax英语口语达人

Why has it been so hard and why does it continue to be difficult to identify these pluripotent cells within tissues?

为什么会那么难呢,为什么在组织中识别多能干细胞,始终困难重重呢

耶鲁公开课 - 生物医学工程探索课程节选

And scientists have been working on this for years and there's been progress, but it's still a very difficult challenge.

科学家们对此已经研究很久了,并取得了进展,但仍有很大挑战

耶鲁公开课 - 关于食物的心理学、生物学和政治学课程节选

The New Criticism, incontestably and without rival, created an atmosphere in which it was okay to notice that things were a little more difficult than they'd been supposed to be.

新批评派，无可厚非，创造了一种很好的风气，大家似乎都能欣然接受,那些看起来还比较复杂的东西。

耶鲁公开课 - 文学理论导论课程节选

I know I've been giving difficult reading responses.

我知道我以前布置的读后感都很难。

耶鲁公开课 - 心理学导论课程节选

And perhaps that is pastoral in a way, going back to what you said, that I do think of myself in many ways as doing pastoral counseling, particularly in the most difficult circumstances when there's been a crisis, a death, a serious accident.

也许某种意义上这像是种牧师与受众，回到你刚才说的，很多时候我觉得自己,就是作为一个牧师指导学生，尤其是在极其困难的情况下,比如出现了危机，伤亡，或者严重事故。

普林斯顿公开课 - 人性课程节选

I want to illustrate one of the reasons why it has been so difficult to get a grasp on the hair cells in the inner ear.

我想用图例为大家说明一下,为什么难以捕获内耳中的毛细胞。

斯坦福公开课 - 7个颠覆你思想的演讲课程节选

Why is it difficult in some cases to produce a vaccine when we've been successful in so many others?

为什么某些疾病的疫苗很难研制,即使我们已经成功生产了很多种疫苗

耶鲁公开课 - 生物医学工程探索课程节选

However, for dietary intake, there have been fewer advances like that because it's such a difficult thing to get a hold of.

然而,对于饮食摄入量,和那些比则进步要少,因为这很难把握

耶鲁公开课 - 关于食物的心理学、生物学和政治学课程节选