The population quantity is obviously changeable, but population culture construction is behind still.

人口质量显著改变，但人口文化结构依然落后。

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Objective The study aimed to learn the population quantity and dynamic of Populus pruinosa in Tarim basin.

目的了解塔里木盆地灰叶胡杨种群的数量及动态。

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The result revealed that there was obviously changed in age structure and reproduction structure of L. lagurus with the decline of the population quantity.

结果表明，随着草原兔尾鼠数量的下降，种群的年龄结构和繁殖结构都发生了明显的变化。

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Population growth, urbanisation and climate change are putting stress on the quantity and quality of water supplies, a concern for businesses that rely on water.

ECONOMIST: 2012 in focus