李阳英语听力突破掌上宝07 参观工厂

[00:00.00]M:Before we begin the tour of the factory,do you have any more questions?
[00:04.00]W:Yes,I have one.I would like to know the exect difference between crystal and glass.
[00:09.95]M:Well,real crystal is generally a hard substance in which the atoms are arranged in a highly ordered structure much like the frame work of a shyscraper.
[00:19.57]W:Is that mean that in ordinary glass the molecules are not ordered?
[00:24.27]M:That's right.But most of the glassware made here is actually lead crystal or glass with a high lead content.
[00:31.84]W:Lead! Isn't lead poisonous?
[00:34.66]M:Not when it's mixed with glass.What it does is to make a very good quality glass.
[00:40.54]I'll be showing you samples of several kinds of glass on our tour.
[00:44.15]If everyone is ready,we'll begin now,please follow me.