And so if you can see there's a microdot in each corner.

你可以看到这里每个角落都有一个。

Next, I'm going to talk about microdot technology.

接下来，我要谈谈技术。

So, I'm holding a couple of microdots that have been concealed behind a stamp.

我手里拿几个，它们被藏在邮票后面。

When this stamp is put onto an envelope, these microdots become absolutely invisible.

当把邮票放到信封上这些就完全看不见了。

The microdot is a very secure method of communication.

一种非常安全的通信方式。

A microdot is taking an 8.5 by 11 page of text, just a regular piece of paper, and reducing it down.

一个将一张普通的 8.5 x 11 的文稿缩小。

Even if someone hands you the magazine and says, " There's a microdot in the magazine, " you will never, if you don't know the page, and the paragraph, and the sentence, you won't find the microdot.

即使有人递给你志，说：" 志里有个。" 如果你不知道哪一页、哪一段、哪句话，你永远也找不到这个。