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Lesson 21 William S. Hart and the early 'Western' film 威廉.S. 哈特和早期限的西部影片 First listen and then answer the following question. 听录音，然后回答以下问题。 How did William Hart's childhood prepare him for his acting
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[6] One group, led by John Matese, professor of physics at the University of Louisiana at Lafayette, confirms the notion that it is most likely to be a brown dwarf, a star that never accumulated enoug
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So the solar system is really quite enormous. By the time we reach Pluto, we have come so far that the Sunour dear, warm, skin-tanning, life-giving Sunhas shrunk to the size of a pinhead. It is little more than a bright star. 所以，太阳系确实是
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Of course we have no prospect of such a journey. A trip of 240,000 miles to the Moon still represents a very big undertaking for us. A manned mission to Mars, called for by the first President Bush in a moment of passing giddiness, was quietly droppe
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The Oort cloud is a spherical haze of comets that surrounds our entire solar system. We often get the false impression that the solar system ends with Pluto. In fact, beyond Pluto is the Oort cloud, encircling everything else like an enormous shell.
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The first leg of the semi-final showdown between Real Madrid and Manchester City in the UEFA Champions League. Real boast a record ten titles in the European club competition while this is only the first time City have made it to the last four. Altho
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