Instead, farmers in developed countries use recycled wastewater that often meets drinking-waterstandards.
发达国家的农民使用的净化水有时甚至达到了饮用水标准。
2
Before being taken by drains to reservoirs, and thence to treatment plants where it is cleaned to drinking-waterstandards.
而后通过排水管进入水库,再从那儿运送到水处理厂,经过净化,最终达到饮用水标准。
3
Every year, Americans produce 12 trillion gallons of wet sewage and burn 21 billion kilowatt-hours of electricity to clean it to drinking-waterstandards.