Now, in order for us to examine the overall impact of a health condition both on life expectancy as well as on the quality of life lived, we need to use a metric called the DALY, which stands for a Disability-Adjusted Life Year.
现在，为了让我们准确的知道 健康对寿命和生活质量的全面影响 我们需要用到 一个叫做DALY的度量单位， DALY是伤残调整生命年的缩写。