And I would suggest palindrome as a great example of that. That's easy to think about recursively. It's much harder to think about iteratively. And you want to get into the habit of deciding which is the right one for you to use. And with that, we'll see you next time.

其它的问题可能用递归的方式,可以更好的解决,而直接思考可能很困难,这时你就得养成做出,正确选择的好习惯了,下周再见。

麻省理工公开课 - 计算机科学及编程导论课程节选

So it's harder and... But I mean, exams themselves are not much harder than what I expected them to be.

所以这难一点……但是考试本身没有比我想象的难多少。

来自西班牙的留学生 - SpeakingMax英语口语达人

Got it.At one end though, s the Wall Street end, s much harder to see direct government interference.

明白，但是另一方面，华尔街，it’,很难看见，it’,政府的直接干预。

斯坦福公开课 - 经济学课程节选

so it's much, much harder to run the ball because there're so much more chance and opposition.

所以带球跑是非常非常困难的，因为中间有太多的空挡和反击。

美式足球 - SpeakingMax英语口语达人