She adds that demographics examines the causes of improved longevity.

她还说，人口统计检验寿命增长的起因。

youdao

We tested the hypothesis that common haplogroups predict risk of ischemic cardiovascular disease, morbidity from other causes, mortality, and longevity in a general population of European descent.

我们在欧洲家系一般人群中证实了假说共同单倍群可预测缺血性心血管病的危险性、其他原因患病率、死亡率、生存率。

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In term of different types physical and chemical analysis and sample inspection are proceeded to explore their causes. Its solution is put forward to increase product quality and die longevity.

针对不同的种类进行理化分析和抽样检查，探究原因，提出对策方案，以提高产品质量和模具寿命。

youdao

The very reasons why George Bush fared so badly at the polls in 1992 namely, that the expansion started at a modest gradual pace and that labour-saving (cost-reducing) investment was an early distinguishing feature are among the leading causes of the boom's longevity.

ECONOMIST: Politics and the boom | The