关键词 : 人口分布;城市化;人口数量;生育水平;人口转变 [gap=45128]Key words: population distribution; urbanization; population; fertility level; demographic transition
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low-fertility level 低生育水平
low fertility level 低生育水平
soil fertility level 地力水平
different fertility level 不同肥力
A low fertility level 低生育水平
indicator of fertility level 肥力水平指示剂
stabilizing low fertility level 稳定低生育水平
integrated soil fertility level 土壤综合肥力水平
The overall fertility level in Mengding Mountain is not high.
蒙顶山茶园土壤肥力质量总体水平不高。
The experiment assumed two kinds of the rice soil of different fertility level.
试验是采用肥力水平不同的两种水稻土进行。
The fertility level of the reed fields in Yangtze River basin is higher than that in Hanjiang River basin.
长江干流苇田肥力高于支流汉江的苇田肥力。
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