单词：request to send (rs)
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By their very definition,black holes are 1) objects which are not supposed to 2) emit anything .It therefore seemed that the area of the 3) event horizon of a black hole could not be regarded as its 4
疯狂英语2002年
Travis--colder~~ i'm in love with everything with every face i've ever seen and every place i've ever been has left its mark upon my worries i color in the world i see i pick apart the melody 'cause maybe there's a symphony caught inside but there's
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Why does salt dissolve in water but oil doesn't? 为什么盐可溶于水而油却不行呢？ Well, in a word,chemistry. But that's not very satisfied, isn't it? 总的来说，是化学作用。但这并不令人满意，对吧？ Well, the reason
TED演讲教育篇
By Selah Hennessy Dakar 05 October 2007 A Congolese government spokesman announced Friday that the country's transport minister has been fired for incompetence, after a deadly plane crash Thursday left at least 37 people dead. As the flames from the
2007年VOA常速英语（十月）
In 1875, when a young German in Kiel named Max Planck was deciding whether to devote his life to mathematics or to physics, he was urged most heartily not to choose physics because the breakthroughs had all been made there. The coming century, he was
万物简史
MOSCOW, Jan. 27 (Xinhua) -- Russia should adopt tougher security measures（安全措施） to ensure transport safety, Russian President Dmitry Medvedev said here on Thursday after he came back from the Davos Forum. The president visited Moscow's su
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