SSS 2010-04-27
时间：2018-12-24 作者：英语课 分类：Scientific American(四)月
In 1970, the Soviet 1 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 2 or parked in such a way as to render the reflector inaccessible 3. Now after 40 years on the lunar surface, the reflector has been found.
A team at U.C. San Diego has been searching for it. Earlier this year, NASA’(National Aeronautics 4 and Space Administration）lunar reconnaissance orbiter camera provided images of the regional landing area. A sunlit speck 5 miles from where the team was looking, turned out to be the rover and reflector. The San Diego team was quickly able to pinpoint 6 the reflector's location to within 10 meters. Scientists send laser pulses to the moon and measured signals that bounce back from three reflectors left by Apollo astronauts, along with another Soviet one. This information helps track the moon's position and orbit. And the researchers say that the rediscovered Russian reflector is particularly useful for studying in the moon liquid core and testing ideas about gravity. Says team leader Tom Murphy of the reflector, “It’s got a lot to say after almost 40 years of silence."
- Zhukov was a marshal of the former Soviet Union.朱可夫是前苏联的一位元帅。
- Germany began to attack the Soviet Union in 1941.德国在1941年开始进攻苏联。
- With a telescope you can see the huge crater of Ve-suvius.用望远镜你能看到巨大的维苏威火山口。
- They came to the lip of a dead crater.他们来到了一个死火山口。
- This novel seems to me among the most inaccessible.这本书对我来说是最难懂的小说之一。
- The top of Mount Everest is the most inaccessible place in the world.珠穆朗玛峰是世界上最难到达的地方。
- National Aeronautics and Space undertakings have made great progress.国家的航空航天事业有了很大的发展。
- He devoted every spare moment to aeronautics.他把他所有多余的时间用在航空学上。