Explain in detail T. R. Malthus' theory of population and the various checks to population growth.

详细说明马尔萨斯的人口理论和控制人口增长的各种措施。

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The explanation and demonstration have been included in the mathematic models with the theory of population genetics.

用群体遗传学的理论对所建数学模型进行了解释和论证。

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Therefore, it is instructive to have research on theory of Population Quality and how to reduce differences between East and West.

因此，研究人口素质理论、研究缩小东西部人口素质差异的对策是非常具有现实意义的。

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One theory is that as the population grew, the people quickly exhausted all of the natural resources.

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But across the population the number of children born with disorders is likely to increase if this theory holds true.

BBC: Older dads linked to rise in genetic disorder

The latest theory to gain sway: We don't want our unemployment rate kept down by an exodus of population, so we must stop that tide, too.

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