每当下暴雨的时候,许多城市街道都会积水,行人无法通行,汽车也常常深陷其中。望着满大街的积水,更多的人是在抱怨排水系统的不畅,希望这些水赶紧排走。水资源的缺乏已经成了全球性问题,我国有上百个城市缺水。一方面,积水排不出去,一方面地下水一天天在减少,有心人提出,为什么? Whenever it rains, many urban streets have water, pedestrians can not get through, and cars often fall into it. Looking at the water filled the streets, more people are complaining about the sluggish drainage system, hoping the water quickly drain away. The lack of water resources has become a global problem. There are hundreds of cities in our country lack of water. On the one hand, stagnant water can not go out, on the one hand, groundwater is decreasing day by day, people have suggestions, and why?