单词：nonpiercement salt dome
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Lesson 47 Television Day: The sea TV Commentary: If you looked at the Pacific from a space-capsule you might think that the world was all water. You would hardly be able to see any land at all. Water covers most of the earth's surface. The sea contai
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Some people, called Veneti, were troubled by a wild tribe from the north. 一个叫做威尼西亚的民族，受到北方一个野蛮部落的不断侵扰， So they moved to these islands to get away from these annoying tribes. 于是来到这些小岛
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BP's attempt at securing a chamber around the source of an expanding oil spill in the Gulf of Mexico may be in trouble. In a news briefing moments ago, CEO Doug Suttles said ice crystals had formed inside the containment dome when it was placed over
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我们今天要学的习惯用语都包括这样一个关键词汇，salt。 Salt这个词大家都熟，是盐。人们在生活中少不了它，一切活细胞也都需要它，人们意识到盐的重要性已经有好几个世纪了，所以由s
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Supernovae occur when a giant star, one much bigger than our own Sun, collapses and then spectacularly explodes, releasing in an instant the energy of a hundred billion suns, burning for a time brighter than all the stars in its galaxy. It's like a t
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