世界人口的年龄结构在相当漫长的时期里都没有多大变化,直到近代,特别是18世纪欧洲国家的平均寿命延长后,才开始有了较明显的改变。据西方人口学家估计,从原始社会直到资本主义初期,人类的年龄结构平均大致是14岁及以下人口在36.2% 37.8%之间变动,15 64岁的人口在60.9% 58.8%之间变动,65岁以上人口仅占2.9% 3.4%。
平均寿命 life expectancy ; [核] Average life ; [核] mean life ; [核] mean lifetime
中子平均寿命 mean neutron lifetime ; neutron mean life
观察平均寿命 observation mean life
平均寿命率 [核] mean life rate
离子平均寿命 [物化] ion mean life
故障前的平均寿命 mean life before failure
可靠度和平均寿命 Reliability And MTBF
光源平均寿命 LED Lifespan
平均寿命时间 MTTF ; average life time
预定平均寿命 expected mean life
However,the authority of the National Development and Reform Commission show that private enterprises’ average life is 3.5 years.
但国家发改委数据显示,民营企业的平均寿命只有3.5年,这与民营企业竞争力不强有密切关系。
参考来源 - 我国民营企业竞争力评价研究It isinvolve following several aspects:1: Relations between of ESR signal intensity and exposure dose.2: ESR signal stability after exposure,3: Parameter choice for measuring ESR signal.4: Mean lifetime of ESR paramagnetic center.5: Exposure dose saturated situation of ESR paramagnetic enter.
3、ESR信号测量参数的选择。 4、ESR顺磁中心的平均寿命。
参考来源 - 方解石脉ESR信号特征的研究·2,447,543篇论文数据,部分数据来源于NoteExpress
意大利每届政府的平均寿命是十一个月。
例如,人类的平均寿命在几千年里几乎没有改变。
For example, the average duration of human life has hardly changed in thousands of years.
该综述总结说,跑步者的平均寿命比不跑步者长3年,并且和其他运动形式相比,跑步更能使人延年益寿。
The review concluded that on average runners live three years longer than non-runners and that running does more to extend life than any other form of exercise.
it's a pity that I'm going to die or die too soon, but at least I'm getting more than the average.
我死得太早是很遗憾,但至少我活得比平均寿命长。
You can think, " look, "the average lifespan in the United States " is whatever it is, 82 years.
你可以说,“美国人的平均寿命,“是82岁。
But what's even worse is I'm going to get even less than the average amount of life.
但更糟糕的是,我活得比平均寿命还要短。
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