单词:laser population inversion
单词:laser population inversion 相关文章
By Carol Pearson Washington 30 April 2008 Ten years ago, the U.S. Food and Drug Administration approved LASIK, eye surgery with a laser that enables people to see without glasses. But about five percent of LASIK procedures fail, and those patients ca
In English, the traditional word order of a statement is subject + verb. Never do we change the order except when asking a question. Or do we? If you listened closely, you may have noticed that my statement beginning with the word never failed to fol
EXPLORATIONS - The History of the Laser Welcome to EXPLORATIONS in VOA Special English. Im Mario Ritter. This week, we tell about one of the most recognizable objects in science fiction the laser. It is one of the best examples of how technology can
In last weeks Everyday Grammar, we told you about a few kinds of inversion that are useful in academic writing and common on the TOEFL. But there are others. Today, well talk about three more. In fact, I already used one kind in my introduction. Comp
Hi, I'm Carl Azuz, broadcasting from the CNN center in Atlantic, Georgia. We welcome all of our viewers around the world to the first February edition of CNN Student News. We are leading things off today in Florida with the race for the Republican pr
Science and technology: Air pollution: Blown away 科技:空气污染:吹走它 Retired jet engines could help clear the smog that smothered big cities. 退役喷射发动机可以用来驱逐笼罩大城市的雾霾。 To land at Indira Gandhi A
Another good candidate would be a government-run plant at Badarpur, less than 50km from the middle of Delhi. 另一个较好的选择便是位于巴达普(距德里市中心不到50千米)的官办工厂。 According to the Centre for Science and
The world this week-Business 本周经济新闻 Amazon showed off its first smartphone, which will go on sale next month. 亚马逊展示了将在下月发售的第一款智能手机。 Priced at the high end of the market, the device runs on a versi
The world this week-Business 本周经济要闻 General Electric won its battle to buy Alstom's energy businesses, 通用电气赢得了争购阿尔斯通能源业务的战斗, but only after it substantially altered its bid and gave a commitment t
The world this week-Business 本周政治要闻 Alibaba took its IPO to investors in a roadshow, having priced the offering at between 60 and 66 a share. 阿里巴巴借路演助力IPO,定价区间为60到66美元。 This could value the Chinese e-
The United States Navy has demonstrated a new laser weapon operating in the Persian Gulf. The Laser Weapons System, or LaWS, is deployed on the USS Ponce transport ship. A live test firing of the weapon was recently carried out for Cable News Network
The History of the Laser Welcome to EXPLORATIONS in VOA Special English. Im Mario Ritter. This week, we tell about one of the most recognizable objects in science fiction the laser. It is one of the best examples of how technology can go from the sci
EXPLORATIONS - The Laser: Futuristic Science Found at Your Local Store MARIO RITTER: Welcome to EXPLORATIONS in VOA Special English.Im Mario Ritter. This week, we tell about one of the most recognizable objects in science fiction the laser. It is one
1.____ your support,we might have succeeded in performing the last. A)If we haveB)If we would have had C)If we hadD)Had we had 2.Cars moved very slowly in 1920s,but they____ move more quickly than in 1910. A)were to B)will C)can D)did 3.A____ from ev
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
在这个右撇子占绝对多数的世界,却有这样一群左撇子:他们之中天才辈出,他们对人类文明的贡献和对人类历史、生活的影响远远高于他们在人口中的比例。左撇子到底缘何而来?我们来看
本期内容: Shares in Allergan, a pharmaceutical firm with headquarters in Dublin, fell by 15% in response to suspicion that tax-avoidance legislation would scupper its planned $160 billion merger with Pfizer, an American drugmaker. The deal woul
As the old saying goes: There are only two certianties in life - death and taxes. It's the latter that members of the OECD's Forum on Tax Administration have been meeting about. The group, which represents around 40-different countries and internatio