I'm going to start with the simplest example and slowly add on bells and whistles and make it more and more complicated.

我会从最简单的例子开始,逐渐增加难度,让问题越来越复杂

耶鲁公开课 - 基础物理课程节选

But I want to start in every example, in every situation that I explain to you, with the simplest example, and slowly add on things.

所以我会都从最简单的例子讲起,在我给你们解释的每一个例子里,都会用最简单的例子,然后慢慢增加难度

耶鲁公开课 - 基础物理课程节选

It was much, much harder to raise money.

融资难度大大增加。

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

I find that even ten minutes to start with or even five minutes to start with is like a completely legitimate time, time well spent, just breathing, even with eyes open, I think it's harder when with eyes open, maybe that's something you lead up to.

从十分钟开始,甚至是五分钟,这段时间合情合理，真正被利用了，只需呼吸，甚至可以睁开眼，睁着眼睛会增加难度，你也需要为之努力。

普林斯顿公开课 - 人性课程节选

Imagine how much power it takes to drive an artificial heart, so you've got to have a battery or some way of generating power continuously to operate that and that makes it difficult to think about implantable and so that's a really good example of Biomedical Engineering.

驱动人工心脏所需要的能量是难以想像的,所以需要电池或者是某种持续发电装置,来给人工心脏提供能量,这就增加了人工心脏的植入难度,这是很好的生物医学工程的例子

耶鲁公开课 - 生物医学工程探索课程节选