I just want to cite two of universal significance of factors: population structure and revenue structure.

这里我只想列举两个具有普遍意义的因素: 人口结构与收入结构.

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The first factor is the change of population structure and factor is the change of income.

二是间接需求,主要取决于人口的结构变动和居民收入的变动.

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It is required to maintain good single - plant morphology to form a rational population structure.

必须保持单株形态以创造合理群体结构.

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Landscape design can decide plant arrangement and plant population structure, and reduce plant disease and pests.

植物种群结构, 同时对植物病虫害发生有着直接关系.

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The reasons lie mainly in the population structure, the financial mechanism, the medical transmission, etc.

其原因主要有责任主体、人口结构 、 财务机制 、 医疗递送等因素.

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