Today,scientists know that the Pillars of Hercules was also called the Straits of Gibraltar.

VOA: special.2011.04.26

The difficulty with reading Machiavelli today is that we all think we already know what he knows and that is false.

今日阅读马奇亚维利的困难点,在于我们都认为我们早已知道,他所知道的东西，但那并不正确。

耶鲁公开课 - 政治哲学导论课程节选

And as an aside, those in the room who are among those more comfortable, even if we're not quite filling in blanks today, realize we will very quickly entice you with details that you don't already know.

说句题外话，你们中有一些,看起来聚精会神，实际上开小差的同学，也许我还不能对号入座，但这些人必须意识到，我会一笔带过,一些你们可能不懂的问题。

哈佛公开课 - 计算机科学课程节选

I'm child of the Columbia Space Shuttle, and I need to know all the electronic gimmicks invented yesterday that are already primitive cousins to those developed today from eight to five P.M.in Japan.

VOA: special.2009.04.27

But we know this, in particular, from a series of studies that would be unethical if they were to be done today.

我们知道这点，是通过一系列的实验，出于人道精神,这些实验现在就不能做了。

耶鲁公开课 - 心理学导论课程节选

"And I also know that kids today don't just start smoking for no reason.

VOA: standard.2009.06.22

And he actually did this in the late 1800's, back before even all of the elements that we know today were discovered, really only about 60% or so, 70% were discovered then that we now know today.

他最终在十九世纪晚期完成了这一壮举，难能可贵的是,虽然我们现在已经发现了所有的元素，但在当时已知的元素只有我们现在知道,百分之六七十，在这种情况下。

麻省理工公开课 - 化学原理课程节选

From the beginning of the project till today all of us have learned that today we are talking about another Germany than what we used to know."

VOA: standard.2010.07.27

So basically, at the time he was just going on size and then traits, but what we actually know today is that we can also order things in the periodic table by electron configuration.

基本上，在当时他只能通过大小,和特性来进行，但是现在我们已经知道了,我们还可以通过电子排布来对它们进行排序。

麻省理工公开课 - 化学原理课程节选

This is what's called the Bohr radius, and we'll explain - hopefully we'll get to it today where this Bohr radius name comes from, but for now what you need to know is just that it's a constant, just treat it like a constant, and it turns out to be equal to or about 1/2 an angstrom.

它叫做玻尔半径，我们后面会解释,希望我们今天可以讲到,波尔半径这个名称的由来，但现在你们只要记住,它是一个常数，只要把它当做一个常数对待，它等于,或者是1/2埃。

麻省理工公开课 - 化学原理课程节选