The fraction p a which we may speak of as the survival factor is a measure of the probability at birth that a random individual of the batch shall reach age a under the conditions under which the dat
分数p（a），我们可以称之为生存因子，是衡量在收集生命表数据的条件下，一个随机个体在出生时能够达到年龄a的概率的一种方式。
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