单词：aspheric reflector
单词：aspheric reflector 相关文章
In 1970, the Soviet Union put a laser reflector on the moon, carried by a rover. A few months later, it disappeared. Some speculated that the rover had fallen into a crater or parked in such a way as to render the reflector inaccessible. Now after 40
Scientific American(四)月
Grammar Girl here. Todays topic is the difference between the words historic and historical. A listener, Denise, wants to know if she should say, We sell historic replicas or We sell historical replicas. Was an event a historic occasion or was it a h
英语语法 Grammar Girl
据《科学》杂志报道，苏联的月球车40年前在月球表面留下了激光反射器，虽然经过多年的搜寻科学家始终没有发现激光反射器的踪迹。 4月22日，一组物理学家终于发现了来自反射器的微弱闪
60秒科学
Gain - This is an increase in signal power, due to a boost from an electronic device. Garbage - These are unwanted characters that appear because of either incorrect settings or noise. Gate - These ar
电信英语
2009年一月，当机号1549 飞机迫降纽约哈德逊河，Ric Elias 正坐在第一排。在坠机的当下，他的心中在想什么? 在 TED，他第一次在公开场合说出他的故事。
TED公开课:(不只是)男人经
By Brian Wagner Miami, Florida 15 August 2007 U.S. minority population are expanding New data from the U.S. Census Bureau shows that black, Asian, Hispanic and other minority populations are expanding in many districts where whites were once dominant
2007年VOA标准英语（八月）
The Five-hundred-meter wide Aperture Spherical Telescope, or FAST, is now operational in the mountains of Guizhou in southwest China. FAST has been designed to help Chinese researchers better understand our universe, as well as probe the cosmos for e
2016CRI中国国际广播电台
Bart's upstairs neighbor was driving him nuts. He made all kinds of strange noises at all kinds of strange hours. If I tell my neighbor he's noisy, he won't believe me, Bart thought. He'll believe me only if he lives downstairs and hears himself upst
英文短篇故事（纽约）
By Paul Sisco Washington 14 November 2007 At the McDonald Observatory in western Texas, a unique space program has been quietly underway for more than 30 years. It is called the Lunar Laser Ranging Program. VOA's Paul Sisco has more. Research scienti
VOA常速英语2007年（十一月）
英文歌词： We took the long way home, you held my hand, The days so full of all the things we had planned. We walked beyond the green, beyond the day. We shared a dream that i let slip away. I had to find myself. I had to find myself. No use looking
英文摇滚歌曲
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加州英语分级G6
MADRID, Aug. 27 (Xinhua) -- Real Madrid this Monday announced the signing of Croatian midfielder Luka Modric on a five year contact. Modric joins for Tottenham Hotspurs on a deal thought to be in the region of 35 million Euros, ending a long running
英语新闻
UNITED NATIONS, Oct. 28 (Xinhua) -- The headquarters of the United Nations is going to be closed for at least one day because of an expected hurricane, according to a statement issued to the press here on Sunday by the UN spokesperson's office. Due t
英语新闻
Chinese Want Electric Cars, Americans Not So Much Citizens of which country are most likely to buy or at least consider purchasing a plug-in vehicle than any other nation? According to a recent survey conducted by Ernst Young's Global Automotive Cent
阅读空间
The construction of the project was started in 2011 with an investment of 1.2-billion yuan, or about 180 million US dollars. The 500 metre Aperture Spherical Telescope, or FAST, is the size of 30 football fields. It's located in a hollow that was for
2016CRI中国国际广播电台