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。
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。
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。
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