之后研究人员通过“残疾寿命修正年”，或者简称DALY的办法，将这些地址和问题分级，DALY计算过早死亡人数和与污染有关的疾病对人的影响。
The researchers then ranked the sites and problems by " disability life-adjusted year, " or DALY, which measures both early death and the impact of pollution-related disease.
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.
退变性椎间盘疾病，简称% DDD，作为正常老年化过程的一部分，发生于很多人。
Degenerative Disc Disease, or DDD, occurs in many people as part of the normal aging process.
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