But as the world's population has grown, the unsustainable character of human behavior has become a global problem.
但随着世界人口的增长，人类行为的不可持续性特征已成为全球性的问题。
The problem of population and economy is one of the long term problems noticed by human society and is the most important research contents of population economics.
人口与经济问题是人类社会长期关注的问题之一，也是人口经济学最重要的研究内容。
Aqristogensis has become main content of enviroment and health study to control population and raise quality in the future, even is a big problem concerning human prospects .
为控制人口数量，提高人口素质，优生也成为环境与健康研究的主要内容。
Of all the challenges faced with human in the 21st century, the population and grain problem are unavoidable and of great severity.
21世纪人类所面临的挑战中，人口和粮食问题仍然是不能避免的并且是十分严重的。
Of all the challenges faced with human in the 21st century, the population and grain problem are unavoidable and of great severity.
21世纪人类所面临的挑战中，人口和粮食问题仍然是不能避免的并且是十分严重的。
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