单词:carbonado (black diamond)
黑金刚石
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Lesson Six Text A Diamonds Diamonds are rare, beautiful, and also quite useful. They are the hardest substance found in nature. That means a diamond can cut any other surface. And only another diamond
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Lesson 4 Black-lead 第四课 黑铅 What is the black-lead in your pencil made of? If you take a bit of the metal which we call lead, you will find that it is grey in colour, very heavy, and not at all like the black-lead in your pencil. But the lea
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By Nico Colombant Monrovia 04 January 2006 Later this month, Liberia will inaugurate Africa's first elected female president, Ellen Johnson-Sirleaf. Her task will be to help rebuild her war-shattered
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