Experience will show that to live in this way not only increases the life span but is also very healthy.
经验会表明这样的生活方式不仅能延长寿命，而且是非常健康的。
But 20th century medicine did little to increase the natural life-span of healthy humans.
然而，20世纪的医学对健康人的自然生命周期的增长几乎无能为力。
Could anyone ethically put a healthy person into a test that might actually shorten life span?
谁能心安理得地让一个健康人参与可能缩短寿命的试验呢？
But 20th century medicine did little to increase the natural life span of healthy humans.
然而，20世纪的医学对健康人的自然生命周期的增长几乎无能为力。
To be healthy and fit — so that you have high levels of energy and a long life span to do whatever you want.
身体健康——有了充沛的活力与长寿的人生，就能追求你想要的成就。
While science explores how to add even more healthy years to the human life span, a graying society faces inevitable changes in attitude and lifestyle.
当科学探究了怎样在人的一生中增加更多的健康岁月，老龄化社会在生活态度和生活方式上面临着不可避免的变革。
Knowing you have people who support you keeps you healthy, mentally and physically: Chronic stress weakens the immune system and ages cells faster, ultimately shortening life span by 4 to 8 years.
知道有朋友支持自己会让你保持精神和身体健康：长期的紧张会更快削弱免疫系统，让细胞更快衰老，最终将你的生命缩短4到8年。
Knowing you have people who support you keeps you healthy, mentally and physically: Chronic stress weakens the immune system and ages cells faster, ultimately shortening life span by 4 to 8 years.
知道有朋友支持自己会让你保持精神和身体健康：长期的紧张会更快削弱免疫系统，让细胞更快衰老，最终将你的生命缩短4到8年。
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