So when you talk to class four, he says,then it is difficult to teach the little kids in class one.

VOA: standard.2010.02.25

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

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

It is very difficult to find any effect of how parents talk to their kids on how their kids learn language, particularly when it comes to babies.

家长跟儿童的说话方式,并未对儿童如何学习语言,产生任何影响,尤其是在对待婴儿的时候

耶鲁公开课 - 心理学导论课程节选