请专业人士汉译英(关于水污染)

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1、采用抽样调查方法，在流域的上中下游分别选取九个点取水样。聘请专家用模糊综合评价法对各点的水质情况做出综合评价。评价选用国家制定的污水综合排放标准。
Adopting a method of sampling, choose nine points in upper,middle and lower reaches respectively to get water samples. Engage expert to comprehensively evaluate water quality of the each point via a method of vague comprehensive evaluation. The evaluation is complied with national stipulation about comprehensive discharge standard of sewage.

2、对直接排入河道的工业污水来源采取追踪调查的方法，寻找主要污染源。
To carry out a method of tracing and investigation against the industrial sewage directly discharged into rivers so as to search the main pollutive source.

3、调查国家关于河水污染治理相关政策和措施并对有效性时行评价。
To investigate national policy and measures related to the river pollution control and evaluate its effectiveness.

4、估算污水对生态环境破坏和农业生产所造成的损失。
To estimate the destruction against ecological environment and the loss against agricultural production brought by