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。
Modern medicine has increased man's life span.
现代医学延长了人的寿命。
Modern medicine has increased man's life span.
现代医学延长了人的寿命。
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