The Centers for Disease Control says HEPA filters are effective in clearing the air of many particles that cause disease.

VOA: special.2009.07.14

And then, what they did is they made a map of where the particles scattered once they struck the screen.

他们做的是,绘制粒子每次散射位置的图,每当他们撞击屏幕的时候。

麻省理工公开课 - 固态化学导论课程节选

So as the particles on the disk that get the current in the read/write head moving put together millions of these magnetized segments and you've got a file.

通过读写头你就可以得到每个粒子的极性,如果把这些上百万粒子的信息,汇聚要一起就够成了一个文件。

哈佛公开课 - 计算机科学课程节选

That is because the force of the object hitting Jupiter pushed very reflective particles high into the planet's atmosphere.

VOA: special.2009.08.25

Now, I'm not introducing any genetic material at all so I don't have to worry about it replicating because there's no genetic material, all I do is deliver the particles.

这样就根本不用引入任何遗传物质,所以我也不需要担心它会复制,因为根本不存在任何遗传物质了,我所要做的只不过是接种部分微粒

耶鲁公开课 - 生物医学工程探索课程节选

HEPA filters capture almost all particles in the air that are zero point three microns in size or larger.

VOA: special.2009.07.14

And what he would expect is if this Plum Pudding model is true, nothing's really going to happen to the particles, right, they should go straight through, because if they hit an electron, those are so small.

他所预期的是,如果李子布丁模型，是正确的，alpha粒子,不会发生什么事情,对吧，它们会直接穿过去,因为如果它们撞到电子。

麻省理工公开课 - 化学原理课程节选

Homogenization is a process that reduces the size of the fat particles and mixes the fat all through the milk.

VOA: special.2009.07.21

And, so the experiment was to bombard the foil with these alpha particles, and that measure what happens to them.

因此用这些阿尔法粒子,去轰击金箔，将会发生什么事情呢。

麻省理工公开课 - 固态化学导论课程节选

The DNA particles were designed so pieces next to each other contained eighty letters that overlapped, with one placed over the other.

VOA: special.2010.07.20

most chemical and biological systems aren't that simple precisely because you have to worry about many particles and their statistics and the way they might order or disorder.

大多数化学或者生物系统并不是这么简单,因为你必须担心大量的粒子,和他们的统计特性以及它们有序,和无序的情况。

麻省理工公开课 - 热力学与动力学课程节选

He says these particles would offer a more exact method of transporting the short-lived drug, called B-H-three mimetic.

VOA: special.2010.03.16

Everything -- gold, silver, diamonds, particles -- everything accelerates the same way in a gravitational field, due to this remarkable fact.

所有东西,金,银,钻石,粒子,所有东西,在引力场作用下都以相同的方式加速,原因就是这个显著的事实

耶鲁公开课 - 基础物理课程节选

Radioactive particles travel in the wind and get absorbed into soil with the help of rain and snow.

VOA: special.2011.03.29

We show particles interacting with the colon collisions.

我们想表现物质和冷却剂的,互动过程。

麻省理工公开课 - 媒体、教育、市场课程节选

The process uses electricity to help separate electrically charged salt particles from water to make it drinkable.

VOA: special.2010.04.05

So, they took away that gold foil and said is just the alpha particles hitting it some other way?

就是也许这是背景噪音,对吧？于是所以,他们把金箔拿走？

麻省理工公开课 - 化学原理课程节选

The study also noted that when tilled soil particles come in contact with air, soil organic matter is lost through the process of oxidation.

VOA: special.2010.09.28

He understood the interaction of particles of matter, and that's important to set the stage for the Rutherford experiment in Manchester about 10 years later.

他理解物质粒子之间的相互作用，这点很重要,对于10年后他在曼彻斯特搭设,用于卢瑟福实验的平台来说。

麻省理工公开课 - 固态化学导论课程节选

A specially designed collector gathered dust particles from the comet and stored them on the spacecraft.

VOA: special.2009.09.30

So, what we're looking at here is the force when we have two charged particles, one positive one negative -- here, the nucleus and an electron.

我们现在研究的是,一正一负俩个带电粒子之间的,作用力-在这里。

麻省理工公开课 - 化学原理课程节选

They say no-till stores more soil carbon, which helps the soil particles stick together.

VOA: special.2010.09.28

But in fact, if you just run your fingers again and again over this floppy disk you are disorienting those particles or knocking them off perhaps altogether, depending on the medium.

事实上，如果你把手指一次次的在磁盘上面滑动,这些粒子就会变的无极性,或者把它们整个搞坏，而这取决于媒介。

哈佛公开课 - 计算机科学课程节选

He probably suspected it had solid particles that would block the holes.

VOA: special.2010.02.09

And this spin is an intrinsic quality of the electron, it's a property that is intrinsic in all particles, just like we would say mass is intrinsic or charge is intrinsic.

自旋是电子的本征量，它是所有粒子的本征性质，就像我们说质量是本征的或者电荷是本征的。

麻省理工公开课 - 化学原理课程节选

The devices are designed to remove dangerous particles from the air.

VOA: special.2009.07.14

So, having other particles around that have the same energy that you could technically add up if you were adding them up like a wave, you can't do the same thing with particles, they're all separate.

所以，如果它们是波,你可以把其他的,拥有相同能量的粒子加起来，但是你不能把这些粒子加起来，因为它们是分离的。

麻省理工公开课 - 化学原理课程节选

I can see footprints of my boots in the small,fine particles.

VOA: special.2009.07.15

And the reason for this, and this is a very important point about the photoelectric effect, and the point here is that the electrons here are acting as particles, you can't just add those energies together.

这个现象的原因是，这是光电效应非常重要的一个论点,这个论点就是电子,在这里是粒子行为，你不能仅仅把这些能量加在一起。

麻省理工公开课 - 化学原理课程节选

This will be the definition of the mole as the amount of carbon weighing exactly 12 grams, so I would like to know now how many particles, how many carbons are there in that mole.

摩尔的定义就是,12克的碳的数量，我想知道有多少粒子，一摩尔会有多少碳粒子。

麻省理工公开课 - 固态化学导论课程节选