However,much of what we know today about the Grand Canyon was recorded by John Wesley Powell.

VOA: special.2009.10.07

Today we know, for example, if you can put one certain kind of element in your mouth or eat that, it doesn't necessarily mean you want to put the element next to it and your mouth as well, that might not be safe.

现在我们知道了，比如，即使你能把某一种元素放进嘴里,或者吃下去，这也并不一定意味着,你会把它邻近的元素也吃进嘴里,这可能会有危险，但。

麻省理工公开课 - 化学原理课程节选

But I know today in my math class, we were learning about the guys who created RSA Public Key Cryptography.

但是今天的数学课上，我们在学习RSA公钥加密算法的创始人。

积极参与俱乐部活动 - SpeakingMax英语口语达人

In the seventeen hundreds it became similar to the instrument we know today.

VOA: special.2010.05.12

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

Today,we tell you everything you ever wanted to know about snow.

VOA: special.2010.01.05

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

What we're talking about today is how we do know things. Right?

我们今天讲的就是怎样认识事物，对吧？

耶鲁公开课 - 文学理论导论课程节选

"As I've been going around the country talking about the book, I've been meeting young women who have approached me, other immigrant girls,who say, 'You know,we're still struggling with those same issues today."

VOA: standard.2010.07.22

I wish we had time for your questions but I know Tal has a lot of great stuff for you today.

很希望有时间回答你们的问题,但Tal准备了很多精彩内容。

哈佛公开课 - 幸福课课程节选

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

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

We know our brain today can actually change through MRI studies since 1998.

自1998年后通过核磁共振研究我们知道大脑可以被改变。

哈佛公开课 - 幸福课课程节选