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.
其实，随着年龄的增长，脑萎缩或功能性衰退是身体很自然的变化，并不一定是由疾病引起的，但是研究显示，这种自然老化却可以加剧人们患轻度认知障碍（简称MCI，即一种使记忆力衰退的疾病）和老年痴呆症的机率。
Brain shrinkage or atrophy is a natural part of ageing but it is known to be accelerated in people with Mild Cognitive Impairment (MCI) – a kind of memory loss and forgetfulness – and Alzheimer's.
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.
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