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

Because there are no articles in the Korean language, so that makes it really difficult to learn them in English.

因为韩语里面没有冠词一说，所以对他们来讲学习英语冠词真的很难。

韩国人经常犯的失误 - SpeakingMax英语口语达人

It is a little bit difficult in the sense that to have gotten into Princeton, one almost certainly has had to know something about something. Right?

之所以比较困难是因为,一个人如果想要进入普林斯顿大学，他一定,对某个领域有一定了解？

普林斯顿公开课 - 人性课程节选

So I started to talk to the VCs and asking for $10 million at a very, very difficult time in Internet history.

就在互联网历史上最艰难的时期，我开始跟风险投资商接洽，向他们要1000万美元。

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

This proves to be really difficult in the real world because in the real world it's hard to pull apart genes and environments So, you and me will have different personalities ? Why?

这在现实中是很难区分的,因为现实中很难,把基因和环境分开来讲,你和我有不同的性格,为什么？

耶鲁公开课 - 心理学导论课程节选

He says, "Poetry in our own time-- -- such is the complexity of the world we live in-- must be difficult."

他写道，“我们这一时代的诗-,正如我们生活着的世界-,让人费解“

耶鲁公开课 - 文学理论导论课程节选

I don't want to have to deal with heat escaping to the outside environment in a way that might be difficult or complicated to measure or calculate.

我可不想处理跑到,环境中去的热量，那测量或,计算起来会非常麻烦和复杂。

麻省理工公开课 - 热力学与动力学课程节选

Ulysses is not difficult to read, and it richly rewards each reader in wisdom and pleasure.

尤利西斯》不难读，它会给每位读者以智慧和愉悦。

耶鲁公开课 - 1945年后的美国小说课程节选

I think that we are in a difficult situation but maybe let's not panic about it.

我认为我们正处于一个困难时期,但是也许我们不用为此而恐慌。

耶鲁公开课 - 金融市场课程节选

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

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

The next difficult thing is to consider motion in higher dimensions.

更难的就是,要考虑更高维的运动

耶鲁公开课 - 基础物理课程节选

So while the relationship of D to some of the laws in the Covenant Code is often--not always but often--one of revision, the relationship between D and the laws in the Priestly source is more difficult to characterize.

那么，尽管申命记材料和契约法典中的律法的关系,往往是，不是总是而是往往，是修订，申命记材料中的,律法和祭祀派材料的的关系则更难定义。

耶鲁公开课 - 旧约导论课程节选

He learned Dutch-- and Dutch is a very difficult language-- in 1696, while the Turkish war went on, or one of them he went off to Western Europe incognito as an embassy soldier.

他学会了荷兰语,荷兰语是很复杂的,在1696年,当土耳其战争发生的时候,或者其中一次战争时,他以一名大使馆军人的身份匿名去了西欧

耶鲁公开课 - 欧洲文明课程节选

or places miles away, maybe in Timbuktu or whatever, who find it difficult to get educational materials from the local university or whatever, can watch certain lectures from Yale on the web.

或者更遥远的国度,像廷巴克图,他们可能在当地大学,不容易得到这样的教育资源,他们就可以到耶鲁网站观看这些视频

耶鲁公开课 - 博弈论课程节选

And one reason Bowman believes this is that we have such a difficult time in understanding other peoples and other cultures is that the very idea of defending one's honor has largely been devalued in the modern west.

鲍曼给出了一个理由,正是因为西方社会中,对维护荣誉的观念早已淡化,才导致他们对其他社会群体,和特定文化的不理解。

耶鲁公开课 - 政治哲学导论课程节选