英语翻译Environmental Life Cycle Assessment (LCA) is a technique

英语翻译
Environmental Life Cycle Assessment (LCA) is a technique for tracing out all theenvironmental effects and resource needs of a new product or process through the materialsuppliers,through manufacture,use and disposal.It is intended to provide a comprehensiveassessment of environmental effects.For reasons of lack of data,complexity of analysis and uncertainty,life cycle assessments often draw arbitrary boundaries (to eliminate all possiblesuppliers) and stop at the stage of just producing an inventory of emissions and resources rather than proceeding to assessment and improvement.
Material Flows and Cycles is a technique for tracing material use and location over time.Forexample,steel is routinely recovered from products such as automobiles,melted and re-used in aclosed recycle loop.Some materials are disposed of into landfills,although the material may sometime in the future be recovered and re-used.Materials can move between the anthroposphere (the manmade environment) and the natural environment In recycling materials,there is a distinction between closed-loop (re-use for the same function) and open loop (re-use in a different function,typically with lower quality requirements).In tracing materials flows,it is important to be clear about the boundaries of analysis and the uncertainty of mass measurements.
希望有能力的人自己翻译,要意通句顺,

环境生命循环评估（LCA）是个通过物资供应者,制造,运用和分配等阐明新产品或者新操作流程的环境影响和资源需要的技术.他的目的在于提供全面的环境影响评估.由于缺乏数据,分析复杂,不确定因素多的原因,LCA严格的划定了界限（为了去掉所有的供应者）而仅仅停留在制作出排放以及资源需要的清单的阶段,而不是进一步的进行评估和改善.物流及其循环是一项随时间不断变化找到物资运用以及地点的技术.例如,铁常规来说从比如说汽车中回收,加以溶化和重新利用形成一个闭合的再利用环路.虽然一些物资可能在将来会被重新循环并加以利用,但还是有许多物资被处理进入了垃圾场.物资可以在人工以及自然的环境中流动.在闭合的环路（同用途在利用）和开放环路（异用途在利用,通常质量要求不高）.在分析寻找物流的过程中,清楚的了解分析以及大规模测量的不确定行的区别是非常重要的
本人非此专业人士,专业词汇可能不是翻得很准,请原谅