When melting snow-crystals or raindrops fall through very cold air, they freeze to form small particles of ice, called sleet.

VOA: special.2011.01.11

In their silence they were themselves. "They"ve only recently learned to sell these crystals since the highway was built about ten years back.

只有在平静中，她们才显露出自己的真实面目,“她们是在最近才学会卖这些水晶石的，大概是10年前。

耶鲁公开课 - 1945年后的美国小说课程节选

We started with this hypothesis of octet stability and I'm talking about properties of ionic crystals.

我们从八隅律的稳定性假设开始,我们讨论到了离子晶体的性质。

麻省理工公开课 - 固态化学导论课程节选

Clouds with extremely cool water are mixed with man-made ice crystals, such as silver iodide and metaldehyde crystals.

VOA: special.2011.01.11

Whereas, ceramics, ionic crystals will resist until they shatter.

但是，陶瓷，离子晶体就会抵抗外力，只到它们破碎。

麻省理工公开课 - 固态化学导论课程节选

It took him several weeks to learn how to string the crystals, and how to separate them so they would look nice.

VOA: special.2009.05.18

And, what we will do next day is we will look at the consequences of such an energetic set up, and rationalize that when ions form, by necessity we must form ionic crystals.

明天我们要做的是,观察一下,这样一个充满活力的创造的结果，然后合理地解释要想得到离子，我们必须先得到离子晶体。

麻省理工公开课 - 固态化学导论课程节选

As many as one hundred crystals may join to form a snowflake larger than two and one-half centimeters.

VOA: special.2011.01.11

Where do we find these ionic crystals?

我们如何得到离子晶体？

麻省理工公开课 - 固态化学导论课程节选

Snowflakes come in different sizes. As many as one hundred crystals may join together to form a snowflake larger than two and one-half centimeters.

VOA: special.2010.01.05

The song was released under the name of another Phil Spector group called the Crystals.

VOA: special.2011.03.21

Today the ball is larger and covered in more than two thousand crystals.

VOA: special.2009.12.28

All snow crystals have six sides, but they grow in different shapes.

VOA: special.2010.01.05

Snow crystals grow in one of two designs - plate-like and columnar.

VOA: special.2011.01.11

Fresh snow is made largely of air trapped among the snow crystals.

VOA: special.2010.01.05

Snow crystals grow in one of two designs platelike and columnar.

VOA: special.2010.01.05

It contains many groups of tiny ice particles called snow crystals.

VOA: special.2010.01.05

These crystals grow from water particles in cold clouds.

VOA: special.2010.01.05

Snow crystals have many surfaces to reflect sunlight.

VOA: special.2010.01.05

Columnar snow crystals look like sticks of ice.

VOA: special.2010.01.05

Ice crystals form on the leaf surface.

VOA: special.2010.01.12

Platelike crystals are flat.

VOA: special.2010.01.05

"little guide to different types of snowflakes sectored plates and capped columns and hollow columns and all different types of crystals.

VOA: standard.2009.12.19

"SnowCrystals.com is a website that is about snowflakes and snow crystals and generally ice phenomena,"

VOA: standard.2009.12.19

And I even have a section on what I call 'designer snowflakes,' which is us growing crystals in the lab,trying to understand how the physics works."

VOA: standard.2009.12.19