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James Fries把人类平均寿命的可能上限定为85岁。
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