Doesn't respond as well to killed vaccines, and that's why the Salk vaccine has to be injected at a high dose.

但却对灭活的疫苗没有那样强烈反应,这也是索尔克氏疫苗为何,必须大剂量注射的原因

耶鲁公开课 - 生物医学工程探索课程节选

but it is imperative that you do not forget things as simple as brushing your teeth.

但不要忘记像刷牙这样的小事也是必须的。

Make sure 实战 - SpeakingMax英语口语达人

What this entails is just trying to stop controlling things, but I also mistake it a little bit because by stopping controlling things, you're going to control it more.

必须的是,试着放手不去控制事物，但这也是个悖论,因为想不控制事物，反而会加强控制。

普林斯顿公开课 - 人性课程节选

So realize you don't have to get it right the first time, but you have to listen and watch to what actually those problems are and that is one of the roles your teaching fellows play.

请认识到，并不是要你第一次就把事情搞对，但是你必须听听，看看,问题是到底什么，这也是你们的助教,扮演的一个角色。

哈佛公开课 - 计算机科学课程节选

The ones who would conserve energy, that is they were sedentary when possible, other then when they had to go get food would again not waste their calories but would save them and contribute to the gene pool.

那些保存能量的人,那些能躺不坐,能坐不站的人,除非必须再次寻找食物,否则是绝对不会浪费能量的人,也是对基因库有贡献的

耶鲁公开课 - 关于食物的心理学、生物学和政治学课程节选

It's very easy to use. But something you really should master.

这个句型很容易就能学会，这也是你必须得掌握的一个句型。

When 课堂 - SpeakingMax英语口语达人

We have to make finance work for real people, so for me that meant understanding human frailties and understanding human psychology to make things work.

金融必须服务于现实中的人们,对我也是一样,于是就要了解人性弱点,了解人们的心理,这样才能对症下药

耶鲁公开课 - 金融市场课程节选

This is the kind of surveillance that's needed to really make an impact and this is why-- one of the other ways where engineering approaches are needed in order to solve medical problems like this one.

这是一种必需,起到一定作用及,影响的监测观察,并且这就是,这也是在解决类似这种医学问题时,必须采取工程方法的原因

耶鲁公开课 - 生物医学工程探索课程节选

We've extrapolated that people have property rights and so whether or not it would be a good thing or a nice thing or even a necessary thing for the survival of some people, we don't see that that justifies the violation of the right that we've logically extrapolated.

我们已经推出人们有财产权,所以，就算是为了做好事，做善事,甚至是为了让某些人活下去而必须做的事，那也是不能证明，侵犯这些推定的权利,就是正当的。

耶鲁公开课 - 公正课程节选

And as Maslow adds, "We must remember that knowledge of one's own deep nature " is also simultaneously knowledge of human nature in general."

正如Maslow所补充，“我们必须记住对一个人深层本性的认识,同时也是对普遍人类本性的认识“

哈佛公开课 - 幸福课课程节选

It's something you can keep working on, that I need to keep working on, even Professor Raboteau needs to keep working on.

大家必须做到持之以恒，这也是我所追求的，甚至Raboteau教授也是一样。

普林斯顿公开课 - 人性课程节选

Well, for a thing called main which itself is a function but a function I wrote, a tool I am writing at the moment not like printf which someone else wrote long ago, I have to say where does main start, where does main end, and I do that by using these curly braces.

至于这个名曰main的函数,由我们自己写的函数，也是一个工具,只不过由我们自己编写，而不是像printf那样已经由前人写好了,我们必须要说明main在哪开始，在哪结束，这样我们就要用到大括号了。

哈佛公开课 - 计算机科学课程节选

So, these are all the fundamentals that are involved in chemistry that relate to physical chemistry, organic chemistry, inorganic chemistry, biological chemistry, and are a solid foundation for studying any kind of life science.

所必须知道的最基本的化学知识,这些都是和物理化学,有机化学，无机化学，生物化学有关的基础知识,也是学任何生命科学的基础。

麻省理工公开课 - 化学原理课程节选

Here, too, gets a little ugly and this is why I tend not to like this construct, at least in C, but sometimes it's necessary or it's the simplest way to achieve this goal.

这里也有点难看的，这也是为什么我,不太喜欢这个结构，至少在C语言中，但是有时它是必须的,或者它是达到目标最简单的方法。

哈佛公开课 - 计算机科学课程节选

Now, the problem, or one of the challenges with clinical trials of vaccines is that you have to enroll a lot of patients into clinical trials because only a few are going to get sick in any case, only 20 out of 100,000.

现在的问题是,这也是疫苗临床试验的挑战之一,临床试验必须包括足够多的病人,毕竟只有一小部分人会被传染,十万人里面只有二十人被传染

耶鲁公开课 - 生物医学工程探索课程节选

In this case the promoter, which is a sequence of DNA that is positioned right in front of the gene of interest, the promoter is the betagalactoglobulin promoter in this case, and betagalactoglobulin is a milk protein.

这里涉及到的启动子,也是一段DNA序列,它必须刚好位于目的基因序列前端,我们用到的是β-乳球蛋白启动子,β-乳球蛋白是乳汁中的一种蛋白

耶鲁公开课 - 生物医学工程探索课程节选