Although the environmental impact assessment system has been for nearly forty years, theories and techniques are till in the stage of developing and improving.
建立环境影响评价制度已有近四十年的历史，环境影响评价的理论和技术方法等日臻完善。
Life cycle Assessment (LCA) is a quantitative and qualitative analysis tool of environmental impact caused by life cycle of products, techniques and activities.
针对火电厂的环境影响评价，目前已有很多种评价方法，运用生命周期评价方法(LCA)，对超超临界火电厂进行了环境影响分析。
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