这是一个肉眼看不见的巨大无比的漏斗。在许多城市和工矿区,地面来水不够用,就打井抽取地下水。随着人口的增长和生产的发展,采取地下水的量越来越大,而地下水的自然补充和恢复又跟不上,如此入 This is a tremendous funnel invisible to the naked eye. In many cities and industrial and mining areas, the ground is not enough water, dig wells to extract groundwater. With the population growth and the development of production, the amount of groundwater taken is increasing, and the natural replenishment and recovery of groundwater can not keep up, so into