“...碩士 === 國立成功大學 === 環境工程學系碩博士班 === 92 === 　　Because of the energy of petroleum and natural gas...”
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“... life in the world, the energy, such as petroleum and natural gas, are exhausted and their prices...”
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“... industrial development, the energy demand for petroleum and natural gas has been growing up rapidly...”
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“... life in the world, the energy, such as petroleum and natural gas, are exhausted. So the use of coal...”
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