他说用几十年前死亡率统计数据来决定现在来活着的人的预期寿命怎么可能对?统计结果对不对数据样本采集首先必须对否则就不可能对
本帖于 2023-11-08 06:08:07 时间, 由普通用户 anne8 编辑
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