0527慢速初稿

发表于:2011-05-26 20:14 [只看楼主] [划词开启]
If you could build a time machine, what would it look like? Maybe, it should look like a telescope. American scientists are building a space telescope, they hope, will look back over unimaginable distances and time to show the universe close to its beginning. 如果让你来造一台时间机器,它会是什么样的呢?也许它会像一台望远镜。美国的科学家们正在制造一台空间望远镜,他们希望能够通过它“回顾”无法想象的距离和时间,来显示接近宇宙诞生时候的样子。 But this distant past will mainly be seen in infrared light. Visible light is just one form of radiation. Today, telescopes take pictures using forms of light hidden from the eye. 但是这种已经过去的距离主要通过红外线来观察。可见光只是放射线的一种形式,而这台望远镜是通过不可见光的形式来拍摄照片。 The American space agency, NASA, is now building the largest space telescope ever. The James Webb Space Telescope, named after NASA's second director, will have a mirror seven times the size of the Hubble Space Telescope. 美国航空和航天局(NASA)正在制造史上最大的空间望远镜。詹姆斯·韦伯空间望远镜以美国航空和航天局第二任局长命名,它将会拥有大小七倍于哈勃空间望远镜的镜片。 But it will mainly study the universe in infrared light. We usually experience infrared light as heat. But, if you have ever used a TV remote control, you know there are many uses for it. 但是这台望远镜主要通过红外线来研究宇宙。通常我们认为红外线是高温源。但是用过电视遥控器的人都知道,红外线有更多的用途。 The James Webb Space Telescope is a complex engineering project. It will be huge -- about the size of a passenger jet. And it will have to be super-cooled. Because the telescope studies infrared heat, its mirror must be kept very close to absolute zero. That is -273 degrees Celsius. 詹姆斯·韦伯空间望远镜是一项复杂的工程,它很庞大——大小如同一架喷气式客机。并且它必须保持极低的温度,因为它用于研究红外线,它的镜片必须保持在接近绝对零度,也就是零下273摄氏度。
最后编辑于:2011-05-26 20:53
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