SSS 2008-06-17
时间：2019-01-08 作者：英语课 分类：Scientific American(六)月
This is Scientific American's 60-Second Science, I'm Cynthia Graber. This'll just take a minute.
When Harry 1 Potter slips underneath 2 his invisibility cloak, he can wander freely undetected, but what about a cloak of silence, one that completely deadens sound. That's just what scientists from Spain's University of Valencia have designed on a tiny scale. They wrote about their research in the New Journal of Physics. A paper published last year showed how such cloak could be made in theory. Researchers proposed using materials made up of what are called sonic-crystals. These are solid cylinders 3 that can scatter 4 sound waves. The Spanish scientists wanted to figure out the specs to make a real acoustic 5 cloak that could totally reroute sound around a given object. According to their models it will take about 200 layers of the sound-silencing materials to make it completely impervious 6 to sound waves. They also think that they will eventually be able to get the same effect with a thinner cover. Among the first applications could be a silent coating for naval 7 ships so that they are rendered invisible to sonar. But even more important could be wallcoverings that would finally protect your ears from those annoyingly noisy neighbors.
Thanks for the minute for Scientific American's 60-Second Science, I'm Cynthia Graber.
- Today,people feel more hurried and harried.今天，人们感到更加忙碌和苦恼。
- Obama harried business by Healthcare Reform plan.奥巴马用医改掠夺了商界。
- Working underneath the car is always a messy job.在汽车底下工作是件脏活。
- She wore a coat with a dress underneath.她穿着一件大衣，里面套着一条连衣裙。
- They are working on all cylinders to get the job finished. 他们正在竭尽全力争取把这工作干完。 来自《简明英汉词典》
- That jeep has four cylinders. 那辆吉普车有4个汽缸。 来自《简明英汉词典》
- You pile everything up and scatter things around.你把东西乱堆乱放。
- Small villages scatter at the foot of the mountain.村庄零零落落地散布在山脚下。
- The hall has a fine acoustic.这个大厅的传音效果很好。
- Animals use a whole rang of acoustic, visual,and chemical signals in their systems of communication.动物利用各种各样的听觉、视觉和化学信号来进行交流。
- He was completely impervious to criticism.他对批评毫不在乎。
- This material is impervious to gases and liquids.气体和液体都透不过这种物质。