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落叶风尘金虫 (知名作家)
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| Africa is a special place for gemstones. It is the home of some of the oldest-known gem mines as well as the source for several new and now-well-known gem varieties. It seems as if every year new finds of important gemstones are made from every part of the continent, and, just as rapidly, these localities often stop producing. Africa is the second-largest continent, with more than 30 million square kilometers, or 20 percent of the earth's land mass. Volumes have been written on some of the localities that produce gems; this article will touch on only the most important mines. We begin in the north with Egypt and some of the oldest documented mines and continue south, where new mines are being found every year. |
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落叶风尘: 金币+30, 翻译EPI+1, ★★★★★最佳答案 2015-04-13 14:29:05
落叶风尘: 金币+30, 翻译EPI+1, ★★★★★最佳答案 2015-04-13 14:29:05
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