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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