Studied area of ground water system is usually a ralaction integrated valley of ground water.

地下水系所研究的范围通常是一个相对完整的地下水流域。

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The optimal models of surface and ground water system were set up based on the theory and method of water resource systems.

据此，采用系统分析理论和方法，建立地表水和地下水系统分配优化模型。

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For many reasons worsening groundwater, water quality by oil leakage into ground water system results in a set of environmental and social issues.

由于各种原因造成油类渗漏进入地下水中，使得水源地水质严重恶化，造成一系列的环境和社会问题。

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Between thirty and thirty-five women used each system to pump water from the ground or a stream.

VOA: special.2010.01.11

Mirra deep cleans any type of in-ground pool surface and water without using the pool's filtration system, hoses or booster pumps, which results in energy cost savings from running these pool systems less frequently.

ENGADGET: iRobot flaunts the Mirra 530 pool cleaning robot, sends the Looj 330 abroad