分析研究环境对建设的制约与建设对环境的冲击，提出轨道交通建设各阶段的环境保护措施。
The environmental constraint on the construction and the impact of construction on the environment are analyzed. Environment protection measures for various construction phases are put forward.
替代方案主要指项目的选址、规模、实施等的替代方案，包括项目环境保护措施的多种方案比较。
The alternatives for the project refer to the alternatives of site, scale and implementation of the project, including comparative alternatives of protection measures.
从区域尺度评价地区生态环境的演化规律及影响因素，对于采取相应的环境保护措施具有重要现实意义。
It is very important for us to assess the mechanism and variation law of ecological environment and its impact factors from regional scale, which will help to take protective measures.
目的为提供环境保护措施成本-效益分析时用的基础依据，研究改善大气污染时可产生的附带健康效益，并使之货币化。
Objective As part of the basic for cost-benefit assessment in decision for environmental protection measures, health benefit from improvement of air pollution was provided through this study.
目的为提供环境保护措施成本-效益分析时用的基础依据，研究改善大气污染时可产生的附带健康效益，并使之货币化。
Objective As part of the basic for cost-benefit assessment in decision for environmental protection measures, health benefit from improvement of air pollution was provided through this study.
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