Countries that do not have a well-functioning civil registration system only have approximate ideas of the Numbers, the longevity and the health of their population.
那些没有建立完善民事登记系统的国家对其人口的数量、寿命和健康状况，往往只有一些粗略的概念。
We know that we are getting even older, and that the nearer a society approximate to zero population growth, the older its population is likely to be - at least, for any future that concerns us now.
我们知道我们越来越老，我们也知道一个社会的人口愈接近零增长，它的人口愈可能老龄化，至少就与我们直接相关的未来来说是这样的。
It can promote statistic schema to converting into the schema of approximate optimal solution and the global searching performance of population can be improved effectively.
它能够促进统计模式向期望模式收敛，提高算法的搜索性能。
An approximate variance estimator for index of population trend developed with delta-method and its application;
应用干扰作用控制指数法评价了阿维菌素、蚜虱灭、蚜虱蓟净等杀虫剂对桃蚜种群控制的作用。
An approximate variance estimator for index of population trend developed with delta-method and its application;
应用干扰作用控制指数法评价了阿维菌素、蚜虱灭、蚜虱蓟净等杀虫剂对桃蚜种群控制的作用。
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