在发展中国家，灌溉是人类排泄物的主要农业用途。
Irrigation is the primary agricultural use of human waste in the developing world.
新发展中国家正在开始工业化，主要是在非洲，人口增长率一再提高，以年轻化为显著特征。
Newly developing countries are beginning to industrialise, primarily in Africa, with high to very high population growth rates, and characterised by a predominantly young age profile.
在一项对200个国家33年内体重指数趋势的研究中，科学家们发现，世界各地的人们体重越来越重，而这主要是由于农村地区体重指数的增加。
In a study of 33 years of trends in Body Mass Index across 200 countries, the scientists found that people worldwide are getting heavier and that most of the rise is due to gains in BMI in rural areas.
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