求翻译：国家水体污染控制与治理科技重大专项“城市水污染控制与水环境综合整治技术研究与示范”主题下“城市水环境系统综合评价体系研究与示范”项目中“城市水环境系统规划与管理技术研究与示范”课题的子课题。是什么意思？

The national water body contamination control and governs the science and technology significant special “the city water pollution control and the water environment synthesis improvement engineering research and the demonstration” under the subject “the city water environment system quality syntheti

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