"The music here is more complicated and harder, but I think it's partly because it's also with woodwinds and brass, basically with a band.

VOA: special.2010.06.21

If it took you a while to digest it, I ask you to think harder.

如果你还要看一会儿才能领会,你就得好好努力了

耶鲁公开课 - 基础物理课程节选

If you think harder, you can get worried about other things.

如果你认真思考,就会遇到其他问题

耶鲁公开课 - 基础物理课程节选

The more we think about this question, the harder it is to answer.

VOA: special.2009.04.18

It's harder than you think, right, but that's the kind of thing that musicians, particularly percussion players, have to be able to execute.

比你想的要困难得多,但这就是音乐家,尤其是打击乐手所必须具备的能力

耶鲁公开课 - 聆听音乐课程节选

A person may become more forgetful or find it harder to think clearly.

VOA: special.2009.03.24

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

Here's a harder case to think about.

下面这个案例的难度更大点。

耶鲁公开课 - 死亡课程节选

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