2015年6月英语六级听力预热练习5
英语六级听力部分算是同学们考试时的难点。听力这部分不能急于求成，需要时间来练习。对于这部分同学们平时在积累词汇的基础上多加练习就可以，听的多了就能掌握技巧。听力音频点击下载.mp3
听力材料：
Artificial robotic hands are getting increasingly better at emulating human hands and the most advanced can even be controlled by thoughts.
But people who wear bionic hands must rely on their sight to know what they are touching or grasping.
Now, though, researchers in South Korea and the U.S. say they have created a stretchable artificial skin that can register heat, pressure and moisture.
This polymer-based elastic material is not designed to replace damaged human skin, such as in burn victims, but rather to provide high-resolution sensory capabilities for prosthetic limbs or for the limbs of humanoid robots.
Team leader Kim Dae-Hyeong, a professor at the Seoul National University School of Chemical and Biological Engineering, says its sensors are an exact copy of human skin.
“The skin can feel pressure, temperature, strain, humidity.Also it is soft, just like human skin, and embedded with heating elements that can make itself warm.”
Kim says the artificial skin is made of a combination of rubber, polyamide and silicon with sensor density of up to 400 per square millimeter.
An artificial hand wrapped in the new skin could distinguish between dry and moist objects and measure the pressure of the grasp.
But Kim says what it still can not do is send those signals to a human brain. That, he says, is the scientists'ultimate goal.
“I hope a robotic limb with this synthetic skin can be used by disabled people.For industrial uses, it can be applied to various types of robots, like a humanoid robot."
Scientists say with this sensitive skin, robots may someday be able to type on keyboards and even change a baby's wet diaper.
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