农村饮用水安全是关系农村居民生活质量和生命安全的大问题。
Drinking water safety in rural area is an important problem on the living quality and safe life.
第四部分，在上述描述和分析的基础上，作者进行了农村居民生活质量指标体系构建的尝试。
In the fourth part, based on the former description and analysis, the author attempt to build up a index system of village habitants' QOL.
最后一部分是在前面分析的基础上得出简要结论，并提出几点改善农村居民生活质量的对策建议。
In the last part, it draws a conclusion based on above paragraphs, and puts forward several Suggestions to improve the life quality of village residents.
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