The famous medical text Compendium of Materia Medica records more than 200 medicinal substances, and Crystal is one of them. Because of its piezoelectricity, a crystal releases a kind of light when it is under pressure. Classified by color, there are many different kinds of crystal. The color of crystal can be changed in the lab.

著名的医学文本《本草纲目》记载着超过200药用物质,水晶就是其中之一n90tM8l9gZ。由于其压电性质,当受压时，水晶会释放一种光w8I]cYrg6oly)JYjraHx。这种物质按照颜色分类,有许多不同种类的晶体PH~iO3q%!oh(&0。水晶的颜色可以在实验室里改变LAiQZD6O4%。

词语解释：

1. Compendium of Materia Medica 《本草纲目》
2. substance n. 物质
3. piezoelectricity n. 压电