单词：Chichibabin pyridine synthesis
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本讲为 2006 年新的教学内容，请对照教材、练习册、语法书听录音！ Unit 5 Text A The New Music 重点词语 distinct a. 独特的；明显的 The two concepts are quite distinc
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Egyptian archaeologists have discovered the bottom part of an unknown pyramid in the Sakkara area about 18 miles south of Cairo. NationalGeographic explorer-in-residence Dr. Zahi Hawass, the Secretary General of the Egyptian Supreme Council for Anti
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Well, I'm sorry Walter couldn't join us. 沃尔特来不了真是遗憾 Oh, yes, well, the Australian trip came up suddenly. 是啊，澳大利亚之旅是突然定下的 He sends his apologies. 他让我代他致歉 Where's Oliver? He's not out of t
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By Tendai Maphosa London 04 March 2008 The British government may be considering barring Zimbabwean athletes from competing in the United Kingdom. As Tendai Maphosa reports from London, the government may be looking at this as a step to prevent Zimba
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