If ZU is the probability that an individual survives to age u for all time t if bu is the birth rate of an individual during her uth period of age for all time t and if r is a solution to翻译
如果Z（U）是一个人在所有时间t内存活到年龄u的概率，如果b（u）是一个人在他的第u个年龄期间的出生率，如果r是解决方案
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