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每日一词 | 人均预期寿命 average life expectancy
人均预期寿命是通过统计各个年龄段的死亡率,推算出新生人口平均可以存活的年数。各年龄段的死亡率越低,人均预期寿命就会越高。人均预期寿命是采用寿命表编制方法测算得来的,并不等同于实际的人口平均死亡年龄。不过,由于能够反映某时某地经济社会、生态环境、人口生 ...
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