单词：Cassegrain reflector
单词：Cassegrain 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
As for the girllet her wait, and watch, and wonder. From now until he arrived in Darwin he would be watched by the excellent Father John, who had his orders, then after that every letter he sent from Darwin would be opened, and he would not be allowe
荆棘鸟
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
1. The House has rejected a debt-limit bill by Senate Democratic leader Harry Reid. The move comes as time is running out for a deal to be reached. The White House says the Treasury won't be able to pay all of its bills without new legislation by Tue
美联社新闻一分钟2011(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）
STEPHEN FEE: It was just after 2pm on December 30, 2013 when the calls began streaming in. Two trains had collided just half a mile outside Casselton, North Dakota, one loaded with grain, the other with crude oil. Volunteer fire chief Tim McLean head
PBS访谈社会系列
SARA JAMES: It's just after dawn in one of the world's most beautiful cities this misty morning a picture perfect start to the day. And Damien Blumire looks the picture of health. But the image is deceptive. DAMIEN BLUMIRE: I've been waiting for a ki
PBS访谈健康系列
The last two sheets were covered by the same precise, almost minute writing. As mean and grudging as her soul. I, Mary Elizabeth Carson, being of sound mind and sound body, do hereby declare that this is my last will and testament, thereby rendering
荆棘鸟
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）
ROME, Oct. 26 (Xinhua) -- Antonio Nocerino turned out to be the unexpected hat-trick hero as AC Milan beat Parma at home on Wednesday to notch up their third consecutive Serie A victory. Nocerino broke the deadlock at San Siro in the 30th minute. Zlt
英语新闻
One of the obsessions you will find in our family is Star Wars. My second son, Cass, has been saving his pocket money, birthday, and Christmas money to buy one of the biggest Star Wars Lego toys: The Death Star. For those of you who are fans, or, at
英语博客 A cup of English
MILAN, Jan. 12 (Xinhua) -- Inter Milan head coach Andrea Stramaccioni said his side are rediscovering their balance following their 2-0 victory over Pescara in the Italian Serie A league at home on Saturday. It went well, because the most important t
英语新闻
Inter's coach Stramaccioni, striker Cassano banned
英语新闻
My son, Cass, has been playing the piano for over a year. He loves it! He practices at home, and attends his weekly class religiously. He really has the discipline thing 'down' as we say, meaning that he understands why and how to be disciplined. I a
英语博客 A cup of English
Nice place you have here. 这地方不错啊 Oh, thank you. 谢谢 Tell me. Does every fence in this town hire muscle? 告诉我，是所有的黑货市场都要雇打手么 I did as soon as I heard about what you did to Cass Derenick. 一听说你对卡
绿箭侠第一季
Lance 兰斯 Sergeant, it's Detective Hall. I have an update on the Dodger case. 队长，我是豪尔警探，幕后者的案子有了新进展 A body was found in an art gallery shot point blank. 艺术馆发现一具被一枪致命的尸体 There
绿箭侠第一季
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
ROME, Nov. 4 (Xinhua) -- Antonio Cassano underwent a heart surgery Friday morning to correct a congenital defect which was uncovered this week. The procedure, which took around 30 minutes to complete, is understood to have gone according to plan, the
英语新闻