节约用水、循环用水可以节能并减少住宅的碳足迹（碳排放量）。

Saving and recycling water can conserve energy and reduce a home's carbon footprint.

人们还可以在封闭的灌溉系统中循环用水以减少用水量、避免径流造成土肥流失。

You’d reduce water use and end runoff by recycling water in a closed irrigation system.

封闭循环用水已成为造纸工业的大势所趋.

System closure has become the trend of the paper industry.