One reason for this is obvious; it's cheaper not to pay people, but the other reason is more interesting.

这样做的其中一个原因很明显;,不用付钱，当然就能省点了，但另一个原因更有意思。

耶鲁公开课 - 心理学导论课程节选

But I think it's a beautiful offering, as a way to prepare food without cooking.

但我觉得这样不用经过任何烹饪的食物是很美妙的。

有益健康的美食店 - SpeakingMax英语口语达人

There will in fact never be a good time to try something new, and there will actually never be a semester where you do have that more time.

实际上我已经没有机会尝试新事物了，而且也不用过学期了,但你们有更多的时间。

哈佛公开课 - 计算机科学课程节选

Here's a way that you can do it in a test tube without using any cells by this process called Polymerase Chain Reaction.

但有一个方法可以让你在试管中完成,不用细胞,这个方法叫聚合酶链式反应

耶鲁公开课 - 生物医学工程探索课程节选

You don't actually give it but give it to a couple of friends just to get feedback.

你们不用真的做演示，但要向几个朋友演示以获得反馈。

哈佛公开课 - 幸福课课程节选

And that's somewhat inconvenient because we're working with wave functions, but it's a reality that comes out of quantum mechanics often, which is that we're describing a world that is so much different from the world that we observe on a day-to-day basis, that we're not always going to be able to make those one-to-one analogies.

这对于研究氢原子，很不方便,但这就是事实,而且在量子力学中经常会出现这种事实,那就是我们要描述的世界，和我们日常所看到的世界,之间的差别是如此之大,以至于我们不能，做出一一对应的类比,但幸运的是我们不用管。

麻省理工公开课 - 化学原理课程节选

I will be also making them available at Allegra for people who would like to just purchase them already printed out so you don't do it yourself, but I know some people really prefer to work online--and certainly for the first week of reading, you can get started because it is online.I don't think things will be available at Allegra's until probably tomorrow afternoon.

我也同样会让这些书的纸质版,能够出现在学校书店这样喜欢读纸质版的同学,就不用到处去买了，但我知道有一些学生更喜欢,在网上阅读，当然第一周的阅读材料都已经放在，放在网上了你们可以开始阅读，所有的阅读材料,在明天下午后都能在学校书店里买到。

耶鲁公开课 - 旧约导论课程节选

But one reason why they ask for money is if you don't pay for therapy you don't think it has any value.

但他们收钱的其中一个原因是,不用付钱的心理治疗，你会觉得它没什么用。

耶鲁公开课 - 心理学导论课程节选

So you can just watch, take notes, but you don't have to copy every last detail down.

这样你们就能观看，记笔记，但你们不用讲每一个细节都记下。

麻省理工公开课 - 固态化学导论课程节选

So, essentially when we're talking about these equations up here, all we're doing is talking about the regular Rydberg formulas, but instead we could go back and re-derive the equation for any one electron atom, which would just mean that we put that z squared term in the front.

所以本质上,当我们讨论，这些问题时，我们说的是常规的，Rydberg公式，但对任何其他单电子原子，我们不用,从头再推到，而是仅仅把，z平方项放在前面。

麻省理工公开课 - 化学原理课程节选

Finally this may be news to you, but this is not English 10A or Math 55, meaning you'll not have to read as much as you will read for 10A or for a history class, and this class is not as difficult as Math 55 so you rest.

最后这个可能对你们来说有些新，但这不是10A号英语课和55号数学课，也就是说你不用像10A号课或者历史课那样做大量的阅读，也不像55号数学课一样难，所以你们可以轻松些。

哈佛公开课 - 幸福课课程节选