单词：Cefozone
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Global Warming and Ozone 全球变暖和臭氧 Could the coming century bring a new threat to the ozone layer? Discover one scientist's model of the effect of global warming and greenhouse gases on ozone -- on today's Earth and Sky. DB: This is Earth and S
(科普英语)Earth and Sky
Scientists have found that levels of a now-banned chemical are rising again in Earths atmosphere. The chemical is called CFC-11. It is the second most common kind of CFC, short for chlorofluorocarbon. Chlorofluorocarbons were once widely used in many
2018年VOA慢速英语(五)月
By Scott Bobb Johannesburg 03 December 2006 Madagascar President Marc Ravalomanana casts his ballot in Antananarivo, 3 Dec 2006 In Madagascar Sunday, voters were choosing a president in what observers say was a mostly peaceful process. Many analysts
2006年VOA标准英语（十二月）
By Michael Bowman Washington 06 August 2006 Secretary of State Condoleezza Rice says the United States is ready to assist Cuba in a transition to democracy, but is not attempting to foment unrest on the island while President Fidel Castro is ill. --
2006年VOA标准英语（八月）
I first heard about the ozone layer about twenty years ago. I was still in school. I thought it was interesting, but I didnt take it seriously. It was a bit like science fiction, I mean, how could there be a giant hole in the atmosphere? Over the yea
纯正英语一分钟
25 大气层中臭氧正日渐稀薄 DATE=3-21-01 TITLE=SCIENCE REPORT - (1)Springtime Ozone Loss BYLINE=George Grow (Start at 1'00
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