Part I concludes, based on an analysis of the functions and principles of tax law on environment, with a theoretical account of the benefits of and the necessity for the law.
并通过对环境税法的作用、原则的分析，从理论上阐述了实施环境税法的优点及其必要性。
A suggest is put forward after investigation and analysis that a return flow prevention gate be built for the benefits of economy and environment.
文中分析认为较经济而可行的方法是在支流下游设立止回闸，防止河水倒流从而保护支流水体。
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