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。
Of things turning out contrary to one's wishes, another can be added: a great invention in medicine leads to a sharp increase in the average span of human life.
例：关于事与愿违的实例除了……以外，不妨再举一个：一项伟大的医药发明大大延长了人们的寿命。
Nearly 30 years ago James Fries at Stanford University School of Medicine put a ceiling of 85 years on the average potential human life span.
约30年前，斯坦福大学医学院的JamesFries把人类平均寿命的可能上限定为85岁。
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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