单词：leaded babbitt alloys
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Exhibit Highlights Butterfly's Beauty, Diversity, Value to Ecosystem Flying Canvases They are gentle, colorful creatures that move with grace and flair. And in a warm and humid enclosure at the Smithsonians National Museum of Natural History in Washi
VOA标准英语2013年(三月)
Today the House will vote on the largest non-defense spending cut in our nations history $315 billion dollars over the next 10 years. These are real cuts, and a signal to job creators that were serious about stopping Washingtons spending binge. Liste
CNN2011年(四)月
That budget now stands at $5,400 million a yeara staggering sum, though somewhat less than we pay for cigarettes and cigars every year. Space expenditures will soon rise some more, from 40 cents per person per week to more than 50 cents a week for ev
名人励志英语演讲
Children's Book Author Natalie Babbitt Dies At 84 play pause stop mute unmute max volume 00:0002:24repeat repeat off Update Required To play the media you will need to either update your browser to a recent version or update your Flash plugin. ARI SH
2016年NPR美国国家公共电台11月
Absurdly, he was excluded from a 1971 National Research Council panel appointed to investigate the dangers of atmospheric lead poisoning even though he was by now unquestionably the leading expert on atmospheric lead. 荒唐的是，一个美国研究委
万物简史
ArcelorMittal will launch a new high-strength automotive steel later this year, throwing down the gauntlet to its rivals in the race to make cars lighter. 安赛乐米塔尔(ArcelorMittal)将于今年晚些时候发布一款新型高强度汽车用钢，
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