寿命
word C2- life span
- life expectancy
- lifetime (of a machine)
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随着医疗条件的改善和人均寿命的延长，老年人在总人口中所占的比例日益提高，我们正在步入老龄化社会。
他疑惑地反问，这根铁杵如此粗大，仅凭人类短暂的寿命怎么可能完成这种壮举。
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