For example, adding copper to glass can make it blue, while adding tin can make it white.

VOA: special.2009.09.16

Energy can flow across the glass but I put a lid on top, and so the water can't get out.

能量可以穿过杯壁流动,但是我在顶上加了盖子，所以水不能跑出来。

麻省理工公开课 - 热力学与动力学课程节选

but from the inside, you know, there's a lot of glass.And you can, like... There's a lot of natural light,

但是从里面看，有很多玻璃。这里有很多自然光，

伦敦的金融中心地 - SpeakingMax英语口语达人

Adding chemicals to the glass can give it different color intensities and effects.

VOA: special.2009.09.16

So first if Professor Drennen can try it through the glass, and we see nothing's happening.

首先如果Drennen教授可以,尝试让它穿过玻璃，我们看到什么都没有发生。

麻省理工公开课 - 化学原理课程节选

For example, lightning can create tubes of glass when it strikes sand that has the right combination of minerals.

VOA: special.2009.09.16

And,he likes to work near the other glass artists in the school because they can exchange ideas and methods.

VOA: special.2009.09.16

But here,the many objects are stored behind glass so the public can explore the Met's rich collection of historical objects.

VOA: special.2010.08.04

One drink equals a bottle or can of beer, a medium glass of wine or a very small glass of liquor.

VOA: special.2009.09.08

The artist can then add a second color of glass to make designs over the first layer of glass.

VOA: special.2009.09.16

At the Smithsonian American Art Museum, you can see a large heart-shaped sculpture made of blown glass.

VOA: special.2009.09.16

The artist can shape the hot glass using metal tools such as jacks, tweezers and shears.

VOA: special.2009.09.16

As you go through the rooms of the exhibit, you can listen to the videos and see back into the courtyard through the glass.

VOA: special.2010.03.03

His electrically colorful and fluid glass works can be seen in museums around the world.

VOA: special.2009.09.16

Or,he or she can place the hot glass on a metal table called a marver to shape the form by rolling it back and forth.

VOA: special.2009.09.16

Impurities in glass such as iron can give it a green or brown color.

VOA: special.2009.09.16

You can enter the glass building and walk downstairs to an underground visitors center.

VOA: special.2010.06.23

The ash clouds include particles of rock, glass and sand that can get into an aircraft's engine and cause it to stall.

VOA: standard.2010.04.17

"Try to see if you can recognize now a glass of good Italian wine.

VOA: standard.2009.11.15