Obsidian is a kind of black glass formed when the heat of a volcano melts the silica material in sand.

VOA: special.2009.09.16

They're actively engaged in the material, actually seeing the phenomena, by making measurements of real world experiments.

学生们能自主地参与到物质中，看见真切的现象，通过对真实世界实验,做出测量。

麻省理工公开课 - 媒体、教育、市场课程节选

And also because, and this is also the reason why the power points are always available, I want you to be engaged in the material.

另一个原因，之所以提前提供幻灯片，我希望你们能充分理解材料。

哈佛公开课 - 幸福课课程节选

Scientists at the Goddard Space Flight Center in Greenbelt,Maryland, found the substance glycine in material brought back to Earth from a comet.

VOA: special.2009.09.30

The institutions and the ideas therefore, that provide for freedom and improvement in the material conditions of life, cannot take root and flourish without an understanding of how they came about and what challenges they have had to surmount.

故此,这些机制和理念,为物质生活条件的自由和改善,提供了基础,但在不知道其根源且,无法预料的挑战之前,机制和理念是不可能扎根的

耶鲁公开课 - 古希腊历史简介课程节选

They also can become weak, expel material from the stomach, and suffer pain in the head or muscles.

VOA: special.2010.04.20

In the material that's usually associated with P Moses is depicted as stretching out his staff, first to divide the waters which stand like a wall so that the Israelites can cross over on dry land; and then he holds out his staff to bring the waters crashing down on the Egyptians.

在经常能和P材料联系起来的材料中,摩西需要满足他的追随者的要求,第一个便是，水像墙一样立在两旁以便于犹太人,可以从中通过，然后为了保住追随者的性命,他用水淹没了埃及士兵。

耶鲁公开课 - 旧约导论课程节选

Men in two special factories worked day and night to make the concrete building material for the dam.

VOA: special.2009.08.12

So this is trying to reverse them that tradition actually get students in and engaged in the course material.

因此这也是试图将学生,从这种传统中扭转出来,从而使他们能更专注于课堂内容。

麻省理工公开课 - 媒体、教育、市场课程节选

To make that genome, the researchers replaced all the natural genetic material in a bacterial cell with a synthetic set of genes.

VOA: special.2010.07.20

So that would probably be de Broglie's answer for why, in fact, we're not observing the wavelength behavior of material on a day-to-day life.

所以那就可能是德布罗意关于,为什么我们无法再日常生活中,观测到物质的波动行为的答案。

麻省理工公开课 - 化学原理课程节选

Material from the RQ36 asteroid will be sent back to Earth in a special protective device.

VOA: special.2011.06.22

Using the material you've learned in class, you'll be expected to answer some big questions for an 8-page final paper that you'll turn in at a date to be assigned.

运用你在课堂上学到的材料，在8页论文中回答某些大问题,然后准时交给我。

耶鲁公开课 - 新约课程节选

They tested the material for genetic information to identify the virus in two chimp communities.

VOA: special.2009.09.08

You take a material like silver and put it in a glass case and that's the definition of a meter.

你拿某种材料,比如银,把它放进玻璃柜里,那是一米的定义

耶鲁公开课 - 基础物理课程节选

NASA captured the material using the Stardust spacecraft launched in nineteen ninety-nine from Cape Canaveral,Florida.

VOA: special.2009.09.30

In other words, how much does the temperature of the whole thing change when you put an ordinary amount of material in there and run a reaction, right. Well, what do you do?

当你放入通常数量的材料,并进行反应时,整个装置的温度,改变有多少，你要做什么？

麻省理工公开课 - 热力学与动力学课程节选

It was made with material saved from aid centers built after the flood in Johnstown.

VOA: special.2009.07.26

Point I want to make about this, though, is that we are going to cover a lot of material that is not in the assigned readings, and we do have assigned readings associated with each one of these lectures.

要说的一点是,我们会有很多,不在拓展阅读里面的材料，而且还有涉及到,每节课内容的拓展阅读。

麻省理工公开课 - 计算机科学及编程导论课程节选

Radiation used in CT scans may be harmful to the genetic material within mummified remains.

VOA: special.2010.06.29

And Milton reasonably alerts his reader to the timeliness of a lot of the material that would be covered in this poem.

弥尔顿合乎情理的向他的读者们,发出了这首诗所要描写的大量内容的警戒。

耶鲁公开课 - 弥尔顿课程节选

She also had enough material for a book on the war in the Soviet Union.

VOA: special.2009.05.17

So some of the Welles's material comes back in but it's never, doesn't comes back in the way Welles had done it.

所以好多威尔斯的形回来了,但是他的神却没有,不像威尔斯原来做的那样。

麻省理工公开课 - 电影哲学课程节选

Portland cement is a material that holds together the sand and crushed stone in concrete.

VOA: special.2009.12.01

And you can contact me if you have some questions in connection with the material.

你能联系我,如果你对这个材料,有问题的话。

麻省理工公开课 - 固态化学导论课程节选

The material and the bacteria were kept warm in an incubator for two hours.

VOA: special.2010.12.07

So we have this pulse, and it's just kind of out there streaming, but we don't like undifferentiated, disorganized material in the West.

我们拥有这种律动,而且就像泉水一样流淌出来,但在西方国家我们不喜欢,没有差别的,杂乱无章的素材

耶鲁公开课 - 聆听音乐课程节选

In some countries, costly repairs were made on many buildings to remove the material.

VOA: special.2009.11.17

That general class of molecules is called receptors and its shown here just as a block of material living in the cell membrane.

这一类分子叫做受体,在这里看起来就像是,生活在细胞膜内的物质

耶鲁公开课 - 生物医学工程探索课程节选

There is in Frost no God, no transcendental source of guidance or consolation, nothing out there in the world but the material conditions of our circumstances.

在弗罗斯特的诗里，没有上帝，没有卓越的指引和安慰，这个世界里什么都没有,除了我们生活环境的物质条件。

耶鲁公开课 - 现代诗歌课程节选