对于许多社区而言，来自生态系统的天然产品除了可作食物之外，还具有医药和文化用途。
Many communities rely on natural products collected from ecosystems for medicinal and cultural purposes, in addition to food.
首先，地球表面三分之二是海洋，尽管海洋确实提供了大量可作食物的鱼类．。
For one thing, two thirds of the earth's surface is water, although this does provide a lot of food in the form of fish.
用热压灭菌法也能将食物、纸张和其它可燃物粉碎并压制成纤维块，产生的纤维块可作燃料或用于厌氧消化。
It also breaks down food, paper and other combustible material into a fibrous mass that can be used either as fuel or for anaerobic digestion.
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