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NPR美国国家公共电台 NPR 2013-09-11

President Obama says a proposal to place Syrian chemical weapons under international control to avoid US military strikes could be a potential breakthrough. While the president appearing on a half dozen network news programs including CNN, had this p

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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

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Up to 480 thousand residents in the American state of West Virginia have been affected by a chemical spill that leaked into the states water supply. At least one fourth of the population has been affected by the spill. The president of a West Virgini

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When we remember something, the neurons in our brains communicate with each other in a particular way. The chemical and sometimes even structural changes that occur create a pathway called a memory trace. Signals traveling along these traces are what