Irrigation is the primary agricultural use of human waste in the developing world.
在发展中国家,灌溉是人类排泄物的主要农业用途。
2
Many parasitic, tropical, and "orphan" diseases are infrequent in the developed world, the primary source of revenue for medicines manufacturers.
许多寄生虫病、热带病和“罕见”病在作为药品制造商主要收入来源的发达世界很少见。
3
For years, my image of the global economy was an inverted pyramid resting on the shoulders of American women, since we are the primary consumers in the world.