在我国,尤其是北方广大地区,地下水是珍贵的优质水源,甚至是部分地区的唯一水源。尽管地下水会经过地壳的充分过滤,但污染依然不知不觉地渗透到了含水层中。而地下水一旦受到污染,要花费惊人的代价才能修复。如果科学有序地开发利用,地下水就是生生不息的可再生资源;如果过度开采、肆意污染,地 In our country, especially in the vast northern areas, groundwater is a precious high-quality source of water and even the only source of water in some areas. Although groundwater will be adequately filtered by the crust, pollution continues to permeate aquifers unknowingly. Once contaminated, groundwater can cost an amazing price to repair. If scientific and orderly development and utilization, groundwater is a renewable and renewable resources; if excessive exploitation, wanton pollution, to