单词：declaration knowledge
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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
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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
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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
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Prosecutors in Ethiopia are seeking the death penalty for 40 people found guilty of conspiring to overthrow the government Peter Heinlein | Addis Ababa 24 November 2009 Prosecutors in Ethiopia are seeking the death penalty for 40 people found guilty
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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
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By Selah Hennessy London 04 November 2009 In this video image, Simon Mann talks to reporters in a courtroom following his pardon by the government in Malabo, Equatorial Guinea, 03 Nov 2009 A British man who was part of a failed plot to overthrow the
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