renewable resource

Water is theoretically a renewable resource, but over-extraction of aquifers threatens its availability in many regions.从理论上讲，水是一种可再生资源，但对含水层的过度开采威胁着许多地区水的供应。

Sustainable forestry aims to harvest timber as a renewable resource without depleting the underlying ecosystem.可持续林业旨在将木材作为可再生资源进行采伐，而不枯竭底层生态系统。