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美国过去100年人均寿命提高30岁的原因,在生活水平提高的基础上,公共卫生和预防贡献了25年,医疗服务只贡献了5年。那么,公共卫生和预防是怎样延长了美国人25年的寿命的?我认为这主要是因为许多美国人一
The reason why the United States has raised its life expectancy by 30 years over the past 100 years is that on the basis of improving living standards, public health and prevention have contributed for 25 years and medical services have only contributed for 5 years. So how has public health and prevention extended American life span to 25 years? I think it is mainly because many Americans