栏目定位：
精心挑选，独家搜罗。开拓你的视野，丰富你的知识。
有兴趣才有提高，让听力成为你的一种习惯和享受吧：）
VOL.2 隐形衣不再是梦想
Duke University engineer on new technology that could make invisibility cloak possible
下载收听
参考文本及注释：
-The cloak! Put the cloak on!
-Dragons! That's the first task! ...
-Where magic goes early, science's not far behind. Some researchers are a step closer to making that invisibility cloak a reality. A group in Duke University figured out how to make objects invisible to microwaves. They use a coil to fudge the cross. And their work might have some practical uses pretty soon. David Schurig is an engineer in Duke, one of the inventors of this new technology, thank you very much for joining us.
-Thanks for having me on.
-Well, tell me about this. I understood it's not like the cloaks of invisibility the military uses, how does it differ?
-------------------1----------------------
-So you wouldn't see what's behind it?
-If you look directly at it, you see what's behind it. And that's the unique thing about this new tech, clocking technology.
-So that's exactly what you will do. You'll be able to cloak something and when you looked at that object, you would see what's behind it, leading the beliefs that there's nothing in between.
-Exactly. It's an effect similar to what happens in a mirage(n.海市蜃楼) where thermal gradients(热梯度) in the air banned light, rays, in a similar way. And the view ahead of the road sig is cloaked behind the image of the sky.
-So, how, I mean if you would, just a saying, put a decade on it, how many decades before we have something that is like a Harry Potter type cloak, you know, invisibility cloak?
-----------------------2------------------------
-It's gonna take a number of years to learn what nanofabrication (纳米制造) even means. Thank you very much. We appreciate this update and a lot of people gonna keep on watching this. Thank you. (All right. Thank you.) David Schurig from Duke University.
答案：
1.-Well, I brought one with me to show. And, here it is. First, as you mentioned it, it's designed to work for microwaves, so you can see it with your naked eye. It's different than what the military uses in that traditional stealth technology(隐形技术) only reduces the reflection of waves that are incident on an object, but they don't do anything about reducing the shadow. This object, when microwaves are incident on it, they are guided around this central region where you can hide something, and reformed on the far side, so that the waves, look as if they traveled through free space.
2.-Well, there's a number of things we need change from here to there. One is, this is a rigid shell, and it's relatively thick, it's not a fabric that you could easily wear. Those things can probably be fixed in a number of decades. They may not be able to be fixed as easily as to go to the visible light spectrum(可见光谱) from the microwave spectrum(微波谱). That's a serious nanofabrication challenge, and that may take a number of years.
点击进入“视听学习资源寻宝团”
