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。

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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。

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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.

多年来，全球经济在我看来好似一座坐落在美国妇女双肩上的倒金字塔，因为我们是全世界的主要消费者。

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So, what we're dealing here with is a situation where the ancient Greeks were very much into mathematics as a way of explaining the world and explaining music in particular And they thought these ratios were primary.

那么,我们现在要潜心琢磨,古希腊人热衷于,用数学来解释世界,尤其是音乐的这种情形,他们认为这些比例才是基础

耶鲁公开课 - 聆听音乐课程节选

Mr. MURPHY: Yeah, but not particularly in the Republican primary world.

NPR: McCain Set to Make White House Run Official

Financially stabilizing the primary care world with consistent monthly fee payments to cover our fixed costs while allowing those docs with better ideas or higher prices to go for the upscale patients or those wanting better art work and longer visits.

FORBES: The Marcus Welby/Steve Jobs Solution to the Medicaid-driven State & County Budget Crisis

The World Bank Group reports that more than 100 million primary school age children around the world remain out of school.

FORBES: Magazine Article