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2013-05-23 12:21
求翻译：Geologists have been studying volcanoes for a long time. Though they have learned a great deal， they still have not discovered the cause of volcanic action. They know that the inside of the earth is very hot， but they are not sure exactly what causes the great heat. Some geologists have thought that the heat is caused 是什么意思？ 待解决
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Geologists have been studying volcanoes for a long time. Though they have learned a great deal， they still have not discovered the cause of volcanic action. They know that the inside of the earth is very hot， but they are not sure exactly what causes the great heat. Some geologists have thought that the heat is caused
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