in spite of falling natality, the population as a whole went up.
尽管
生率在
降，人口总数还是上升了。
生率；生产率
生;
;
;
化;in spite of falling natality, the population as a whole went up.
尽管生率在降，人口总数还是上升了。
2Mean values of leaf natality(A)and leaf mortality(B).
标题： 
2
生率(A)和死亡率(B)
平均值 Fig.
Populations-groups of individuals belonging to the same species-all have three very significant statistical characteristics: per capita birth rate or natality;
种群中每个个体都属于
一个物种，具有三个非常显著统计学特征：生率；
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