3.High School English Listening

If you thought erasable ink was cool, wait until you hear about today’s topic on A Moment of Science: electronic ink.
To begin with a slightly technical explanation, electronic ink consists of three parts: millions of tiny, microscopic capsules, an oily liquid filling the capsules, and negatively charged colored chips or spheres floating inside the capsules. Electrical charges cause the colored chips or spheres to arrange themselves into letters, numbers, and other characters when the ink is spread on a surface.
If that description is slightly confusing, try imagining electronic ink as consisting of millions of clear beach balls. Each ball contains hundreds of white Ping-Pong balls floating in blue dye. The Ping-Pong balls make the top of the beach ball appear white, while the bottom appears blue.
Now imagine that you’ve spread millions of these beach balls on a wide, flat surface and gone up in a helicopter for a bird’s-eye view. You see an all-white field. Using a device to control the movement of the Ping-Pong balls, you cause some of them to sink, revealing the blue dye. With precise control, you could use the resulting patterns of light and dark to create characters.
In a nutshell, that’s how electronic ink works. So what’s it good for? Electronic books, for one. In the near future we may leaf through a volume written with electronic ink that contain hundreds of different texts. With the push of a button, Shakespeare may morph into Dr. Seuss. Another push and the ink re-arranges itself into Crime and Punishment. No matter how it’s used, electronic ink is sure to jolt our understanding of the printed page.
译文：
如果你认为可擦除的墨水很酷，那么等到你听到今天《科学一刻》的主题：电子墨水。
首先是一个略带技术性的解释，电子墨水由三部分组成：数以百万计的微小胶囊，填充胶囊的油性液体，以及漂浮在胶囊内的带负电的彩色芯片或球体。电荷导致彩色芯片或球体在墨水铺在表面时排列成字母、数字和其他字符。
如果这种描述略显混乱，可以试着将电子墨水想象成由数百万个透明的沙滩球组成。每个球包含数百个漂浮在蓝色染料中的白色乒乓球。乒乓球使沙滩球的顶部呈现白色，而底部呈现蓝色。
现在想象一下，你把数以百万计的这些沙滩球铺在一个宽阔、平坦的表面上，然后坐上直升机去鸟瞰。你会看到一个全白的场地。使用一个设备来控制乒乓球的运动，你使其中一些球下沉，露出了蓝色的染料。通过精确的控制，你可以利用所产生的明暗图案来创造人物。
简而言之，这就是电子墨水的工作原理。那么，它有什么用呢？电子书，就是其中之一。在不久的将来，我们可能会翻阅一卷用电子墨水写成的、包含数百种不同文本的书。只要按下一个按钮，莎士比亚可能会变成苏斯博士。再按一下，墨水就会重新排列成《罪与罚》。无论它如何被使用，电子墨水肯定会颠覆我们对印刷品的理解。
重点词汇：
begin with 以…开始，从…开始
millions of 数百万
negatively charged 带负电荷的
beach balls 沙滩球 ; beach ball的复数
hundreds of 成百上千 ; 好几百
beach ball 沙滩球