As gold prices top $1,000 an ounce the highest price for the metal in the last 18 months traders say they expect demand to dip drastically this festival and wedding season.

VOA: standard.2009.09.19

Is there any significance at all, for example, in the number of photons that are hitting the metal or being absorbed by the metal.

举例来说，若干个光子撞击金属,或者被金属吸收究竟是否有意义。

麻省理工公开课 - 化学原理课程节选

That is what makes metal so fascinating, because metallic bonding allows the atoms to glide over one another without resulting in catastrophic failure.

所以这就使得金属具有了特别的性质，因为金属键使得原子可以,在彼此之间流动,而不会千万灾难性的后果。

麻省理工公开课 - 固态化学导论课程节选

Workers stand outside stores, ringing a bell and collecting money in a red metal kettle from shoppers passing by.

VOA: special.2009.11.02

There were people goldsmiths were people who worked in the metal gold and made beautiful things for people jewelry and other things.

有人，比如金匠就是是,铸造金的形状,并且为人民铸造美丽的东西的一群人,包括珠宝和一些其它的东西。

耶鲁公开课 - 金融市场课程节选

In some cases,instead of a cast, a splint made of plastic or metal will be secured over the area to restrict movement.

VOA: special.2009.02.04

So, for example, we were talking about a threshold frequency as in a minimum frequency of light that you need in order to eject an electron from a metal surface.

举个例子来说，我们谈论的临界频率是,光从金属表面逐出一个电子,所需的最小频率。

麻省理工公开课 - 化学原理课程节选

At last he did, he tied the boat to metal ring that was stuck in the rocks.

VOA: special.2010.05.08

So, we do this here for the photoelectric effect, and in terms of the photoelectric effect, what we know the important point is that the incoming photon has to be equal or greater in energy then the work function of the metal.

所以，我们做这个是为了说明，光电效应，在光电效应方面，我们知道的最重要的事情,就是入射的光子能量必须等于,或者大于金属的功函数。

麻省理工公开课 - 化学原理课程节选

The heavy metal enters the body when children breathe the paint dust or fumes in the air.

VOA: special.2009.08.31

So you don't have ductility, which is what you have in metal.

所以材料不具备延展性，而且金属中有自由电子。

麻省理工公开课 - 固态化学导论课程节选

We slept on the hard ground, ate canned beans from cold metal plates and spent our days in the difficult search for gold.

VOA: special.2009.07.04

And there is a relationship here, and that is that the number of photons absorbed by the metal are related to the number of electrons ejected from the metal. So, in this figure here what I'm actually showing is these little sunshines, which let's say are each one individual photon.

这里有一个关系是，被金属吸收的光子,和被金属逐出的电子是相关的,所以，我展示的这个图,是这些小太阳，我们这里代指每一个独立的光子。

麻省理工公开课 - 化学原理课程节选

A book drop is the small metal door in the wall of the building where people can return books when the library is closed.

VOA: special.2009.02.23

that's one way to think about it, and there's also another way, and this is the way that your book presents it. If you, in fact, have two of the same atom right next to each other, let's say you have a crystal, or let's say you're talking about a metal, what you can do is just look at the distance between the two nuclei, and split that in 1/2, and take the atomic radius that way.

这只是一种定义的思路，另外还有其它方法，也就是你们课本上的方法，如果你，事实上，有两个相同的原子彼此靠在一起，比如说你有一个晶体，或者说你讨论的是一个金属，你所要做的就是,看看这两个原子核之间的距离，然后将距离除以二，就得到了这个原子的半径。

麻省理工公开课 - 化学原理课程节选

Metal detectors cannot be used in many cases because landmines can be made of non-metal materials.

VOA: special.2010.05.03

I had my head in and was about to open the lantern, when my finger slid on a piece of metal and made a noise.

VOA: special.2009.05.16

But Ares will use new methods in metal-working science such as friction stir welding.

VOA: special.2009.12.30

They are stored in drawers of metal filing cabinets in a long hallway.

VOA: special.2010.06.28

This metal surface, placed in contact with the water, will heat the water.

VOA: special.2009.04.20

First a gold miner put dirt in a metal pan and added water.

VOA: special.2010.04.25

He stands above a heap of shattered concrete and twisted metal on a windswept hillside in Arab East Jerusalem.

VOA: standard.2009.04.09

You need metal." FAO says it has delivered tools and seeds to 68,000 families in the earthquake zone so far.

VOA: standard.2010.04.02

In fact,India's gold purchase is reminiscent of another year when the yellow metal dominated headlines in the country.

VOA: standard.2009.11.06

In the big cities, the traditional affinity to the precious metal is waning, as trends change.

VOA: standard.2009.09.19

India's Finance Minister, Pranab Mukherjee, says the country's comfortable foreign exchange reserves prompted the Reserve Bank or RBI to invest in the precious metal.

VOA: standard.2009.11.06

Instead of going into a hole on the green, discs are thrown into a raised metal basket that looks a bit like a trash bin covered in chains.

VOA: standard.2010.08.03

But in souvenir photos of those days, more than a few metal flasks, no doubt containing something stronger than Bubble-Up, can be seen on the floor beneath the tables.

VOA: standard.2010.02.25

Now only about "There is change in some people traditionally expected platinum to be an expensive metal, people are looking at it in the same terms as gold values,"

VOA: standard.2009.10.17

"So as you can imagine, if you are say 50,55 or younger, the surgeons will be very hesitant to place these metal joints in your body because knowing that in 10 to 15 years, there's a chance these would fail."

VOA: standard.2010.08.11