他们的方法足够灵活，原则上可以纳入其他重要的生活质量变化，如减少污染物排放总量、降低犯罪率。
Their approach is flexible enough that in principle other important quality-of-life changes could be incorporated—for example, decreases in total emissions of pollutants and declines in crime rates.
以2010年成都市的污染物排放为基准，测算出成都市2010、2015和2020年的污染物排放削减率。
Setting the pollution emission of the year 2010 of Chengdu as the benchmark, the reducing rate of the year 2010, 2015, and 2020 of Chengdu is calculated.
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