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？
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