It isn't the case that defending easy dominates defending hard.

防守平坦之途并非优于防守崎岖之途

耶鲁公开课 - 博弈论课程节选

If you think this class is going to be easy, I think it isn't actually an easy class. It's actually quite a hard class, but I think I can guarantee it's going to be a fun class.

你要是认为这门课挺简单,这不是轻松的课,事实上它有点难,我保证这门课一定很有趣

耶鲁公开课 - 博弈论课程节选

Well in C and other languages that we'll see this semester, you use what's called the for loop, and this as syntax isn't quite as straightforward but once you know what to look for, it's very easy to understand.

在C语言和一些我们这学期将要接触的编程语言中，你将会用到所谓的for循环，也许作为一种语法规则，它看起来不是那么的通俗易懂,但是你一旦知道曲中奥妙，就不难理解了。

哈佛公开课 - 计算机科学课程节选