Population is the main of market. The change of population age structure will bring change of consuming demand and development trend.

人口是市场的主体，人口年龄结构的变动必然也会引起市场的消费需求和发展趋向的变化。

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Growth and development of the individual and the population for rice has change in different population.

不同群体下，水稻个体和群体生长发育均发生了变化。

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We live in a time when the risk of disaster is growing thanks to climate change, population growth, and economic development itself.

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