Back in his laboratory at the University of Calgary,Alberta, he experimented with light emitting diodes, technology he was familiar with as a professor of renewable energy.

VOA: standard.2009.12.13

And if we do, in fact, hit it with light to get the electrons off, it will go back to the straight up in position, or if it gets knocked hard enough it does that, too.

而且如果我们这么做，事实上，用光轰击它以逐出电子，它就会在原位置沿直线返回，或者如果它被撞击的足够猛烈,也会出现上述现象。

麻省理工公开课 - 化学原理课程节选

and of course we've already been gazing at that light back there, and it's not a good example.

如果我们看着那里的灯，虽然这个例子有些瑕疵。

耶鲁公开课 - 文学理论导论课程节选

So, we'll take a little bit of a step back after we introduce quantum mechanics, and talk about light as a wave, and the characteristic of waves, and then light as a particle. And one example of this is in the photoelectric effect.

等我们介绍完量子力学后,我们要回过头来讨论下光,作为一种波和它的波动性特征,以及光作为一种粒子,其中的一个粒子就是光电效应。

麻省理工公开课 - 化学原理课程节选

It's a dream of changing the tradition, of having that individual voice added to the tradition, to have it become part of the official heritage and yet at odds with it, casting a different light back.

这是试图改变传统的梦想，试图在传统中,加入自己的声音，让其成为官方遗产的一部分,尽管格格不入，在后面投入一片不一样的光亮。

耶鲁公开课 - 1945年后的美国小说课程节选

So, if you use a black lamp or something and you excite something up to a higher energy level and then it relaxes back down to its lower energy state, it's going to emit a new wavelength of light, which is going to be visible to you.

如果你用一个紫外灯或别的,东西把某种分子激发到,更高的能级，然后它会掉回,到低能级，它就会释放,一个新的波长的光,这个光是可见的。

麻省理工公开课 - 化学原理课程节选

We'll turn the light back on for a second here.

我们马上要开灯。

麻省理工公开课 - 化学原理课程节选

Do you think I should neck or not? I shall not enter the kingdom of heaven anyway so I don't see what difference it makes.'" And then she writes back, Mary Brittle: "Dear Sabbath: Light necking is acceptable, but I think your real problem is one of adjustment to the modern world.

你认为我是该做还是不该做，我反正都上不了天堂了,因此，我认为做不做都无所谓，之后她给她回信了，玛丽-巴瑞特，亲爱的萨巴斯，你的做法是可接受的，但我认为,你真正的问题是无法融入现代社会。

耶鲁公开课 - 1945年后的美国小说课程节选

So you know that x-rays are higher frequency than UV light, for example, that means it's also higher energy than UV light, and if you think back to our photoelectric effect experiments, do you remember what type of light we were usually using for those? Does anyone remember?

你们知道，X，射线的频率比紫外光高，这意味着，它的能量也比紫外光要高，那么，请大家回想一下我们的光电效应实验，大家还记得当时我们用的是什么光源吗？,有人记得吗？

麻省理工公开课 - 化学原理课程节选