In terms of income, the gap between rich and middle class is growing, but in terms of happiness it is relatively low by broader historical standards.
（ ——牛！作者思想境界太高了，译者）从收入来说，富人和中层阶级的差距是在扩大，但是从快乐的角度来说它比历史上的标准相对要低。
Too often "effort" is overclaimed and luck ignored by those eagerly justifying their class and income advantage over the very hard-working low-paid.
那些在阶级和收入方面比工作艰辛的低薪者占优势的人们，往往过多夸大了“奋斗”，而忽视了运气。
A thinner middle class, in itself, means fewer stepping stones available to people born into low-income families.
一个单薄的中产阶级阶层在本质上意味着那些出身低收入家庭的人可依靠的垫脚石太少了。
The parents who recorded themselves represented a socioeconomic mix: a third each were low-income, middle-income and upper-middle-class or higher.
参与录音者来自于各个阶层：1/3低收入，1/3中产，1/3上层阶层。
Occurrences that a middle-class family can easily weather, such as a car breakdown, can send a low-income family into crisis.
中产阶级能够应付的那些诸如汽车故障事情能够使低收入家庭陷入危机。
Occurrences that a middle-class family can easily weather, such as a car breakdown, can send a low-income family into crisis.
中产阶级能够应付的那些诸如汽车故障事情能够使低收入家庭陷入危机。
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