(单词翻译:单击)
听力文本
From VOA Learning English, this is the Technology Report.
Researchers at Stanford University have developed a new material that can move heat out of buildings and into space. The researchers say the material can cool buildings even on hot days.
The cooling material is a very thin sheet with many layers that could be placed on a roof like solar panels. However, instead of turning sunlight into energy as solar panels do, the material turns heat into infrared radiation.
Shanhui Fan is an electrical engineering professor at Stanford University. He says that the panels have a layer of material that is like sand. He says that the panels act like a mirror. They take heat out of buildings and reflect the light from the sun. He says both the heat and sunlight are sent 100 kilometers into outer space.
"It's a structure that cools itself without electricity input, even under the sun. So, what it does is basically radiate heat to outer space and also reflect the sunlight so it doesn't get heated up by the sun. And the net result is you get something that if you put on the roof will have a temperature below ambient air temperature by a significant amount."
The panels are cool to the touch, even in the sun. Researchers say they can reduce the indoor temperature to nearly 5 degrees Celsius below the temperature outside.
Mr. Fan says it is like having a window into space. He says the heat is sent directly into space without warming the air.
He says buildings in developing countries that do not have electricity or air conditioning could use the panels.
"In areas where one is off-grid, there is a significant potential benefit for storing medicine or even food. In many of these situations, being able to reduce the temperature is important. And this would provide a way to do it."
The Stanford researchers described their technology in the science publication Nature. They say the main problem is creating actual cooling systems using the high-tech panels. They say it may be possible to develop a cooling spray that could be used on existing solid structures.
The researchers believe the cooling spray technology could be developed in the next three to five years. They say as much as 15 percent of the energy used in the United States is spent providing power to air conditioning systems.
And that's the VOA Learning English Technology Report. Give us a like on the VOA Learning English Facebook page. Follow us on Twitter at VOA Learning English. You can also watch videos on the VOA Learning English YouTube Channel. I'm Jonathan Evans.
词汇解释
1.infrared n. 红外线 adj. 红外线的
Infrared detectors have many uses.
红外探测器有多种用途。
2.radiate vt. 辐射；传播；流露；发射；广播 vi. 辐射；流露；发光；从中心向各方伸展 adj. 辐射状的，有射线的
Heat radiates from the heating radiator and spreads to every corner of the room.
热从暖气片散发出来并传播到室内各个角落。
3.off-grid adj. 离网的；(水、电等资源)自给自足的
Rather they are self-sufficient, off-grid homes that provide their own water, power and heating.
而是自给自足，不联通电网的家，能自己提供水，能源和暖气。
内容解析
1.So, what it does is basically radiate heat to outer space and also reflect the sunlight so it doesn't get heated up by the sun.
heat up 加热，变热，升温
Then in the last couple of years, the movement for democracy began to heat up.
于是在过去几年里，民主运动开始升温。
In the summer her mobile home heats up like an oven.
在夏天，她的活动住房像个烤箱那样热起来。
参考译文
这里是美国之音慢速英语科技报道。
斯坦福大学的研究者开发了一种能自动将热量从建筑物内部转移到太空的材料，研究者称这种材料甚至能在大热天冷却建筑物。
这种冷却材料是有很多层的薄片，能像太阳能面板那样安置在屋顶。但它不是像太阳能面板那样将太阳光转化为能量，而是将热量转化为红外辐射。
范善辉是斯坦福大学的电子工程学教授，他说这种面板有一层像沙子的材料。他说这种面板能像镜子那样起作用，将建筑物内的热量排出并反射太阳光，他说热量和太阳光都被反射到100千米外的外太空。
“这种结构无需电力就能自我冷却，即使是在太阳下。所以它所做的基本上是将热量反射到外太空，并反射太阳光，这样就不会因太阳而变热。其结果就是，如果你将它安装在屋顶，那么室内温度就会明显低于环境温度。”
即使是在太阳下，这种面板摸起来也很凉爽。研究者说它们能将室内温度降低到比室外温度低5摄氏度。
范说这种面板就像是对着太空的窗户，热量被直接反射到太空而没有将空气升温。
他说没有电力或空调发展中国家的建筑物可以使用这种面板。
“在没有电力的地区，这种材料对于储藏药物或食物来说是个重大优点，在很多情况下，降低温度是很重要的，这种面板就能提供一种选择。”
斯坦福大学的研究者在科学出版物《自然》上描述了这项科技，他们说主要问题是使用这种高科技面板创造真实的制冷系统，他们说有可能开发出能在现有建筑结构中使用的冷却喷淋技术。
科学家认为这种冷却喷淋技术能在未来3到5年内开发出来，他们说美国使用的15%的能源被用来给空调系统提供动力。
这就是美国之音慢速英语科技报道，在美国之音慢速英语脸书上给我们点赞，在推特上关注我们，你还可以观看我们在油管上的视频，我是乔纳森·伊万斯。
