When it comes to drinking water infrastructure, that systems that clean and transport our water, the American Society of Civil Engineers gives the U.S. a grade D. In some parts of rural America, it's clear why.
说到饮用水基础设施,美国土木工程师协会认为,这些系统可以净化和运输我
的水资源,美国的土木工程师协会给出了D等级。 在美国农村的一些地区,原因显而易见。