Why is cancer one of the leading killers in the U. S. now but wasn't even on the charts in 1665?

为什么癌症现在是美国人的头号杀手,却甚至没有在一六六五年的名单中出现

耶鲁公开课 - 生物医学工程探索课程节选

But now the reason why I came here is

但是现在我来这里的原因是

一见钟情的学校 - SpeakingMax英语口语达人

So the most basic answer that doesn't explain why is just to say well, the s orbital is lower in energy than the p orbital, but we now have a more complete answer, so we can actually describe why that is.

所以最基本的答案是那没有解释,所以我们事实上可以描述，为什么是那样，但是我们现在有一个更复杂的答案，又是有效电荷量。

麻省理工公开课 - 化学原理课程节选

There's different theories about why, but my point right now is simply that people don't necessarily know this but still they're subject to this.

有很多不同的理论对这种现象进行了解释，不过现在我的看法是,人们并不理解这种现象,但却仍然会这样去做。

耶鲁公开课 - 心理学导论课程节选

But why do you think these are the number one and two now?

你们认为这两种病为什么会名列前茅

耶鲁公开课 - 生物医学工程探索课程节选

Right. Now I have two copies of two, but that's why I kept this thing around.

对的，现在我有两份数值，这就是为什么我保持这个东西。

哈佛公开课 - 计算机科学课程节选

So the environment has changed in a short time but evolution has not and there's a real mismatch now, which explains why you probably like Haagen-Dazs better than you like cauliflower.

所以食品环境在短时间内就能改变,但是进化不能 于是就有了错位,这也就能解释为什么哈根达斯,比菜花更受欢迎

耶鲁公开课 - 关于食物的心理学、生物学和政治学课程节选

Why not just put our own orgasmitron hat on with a little-- not rat lever, but now human lever-- with the electrodes stimulating our own brains so that we get this intense burst of pleasure?

我们为何不带上电子高潮帽-,把老鼠杠杆变成人类杠杆-,用电极刺激我们的大脑,获得强烈的快感？

耶鲁公开课 - 死亡课程节选

This is all by means of review but the question you can now ask is, "Fine. That's why moral feelings might evolve, but what do we know as psychologists about the emergence in nature of moral feelings in individuals?

这些知识我们以前都学过,现在你们要问一个问题，“好了，道德情感是这样产生的，但我们心理学家知不知道,自然界中的个体的道德情感是如何出现的？

耶鲁公开课 - 心理学导论课程节选

But now, hopefully, we understand where that comes from, why it is that we use the shorthand notation.

但是现在希望我们明白,那是从哪来的，我们为什么要用简化形式。

麻省理工公开课 - 化学原理课程节选