也包括人口统计变量的受访者，如年龄，职业和收入。
Also included are demographic variables for respondents, such as age, occupation, and income.
中产阶级最重要的特征是他们在家庭背景、职业和收入上差异巨大。
One of their most important characteristics is variety middle-class people vary hugely by background, profession and income.
我会专攻于研究学术成果，因为它是了解熟练劳动力的主要途径，对后来的职业和收入产生影响。
I will specifically look on academic achievement, as it is the main route to more skilled labor, and its impact on later career and income.
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