当学者们研究婚姻时，他们常常把研究重心放在白人身上，然而当研究到非裔美国人时，他们又常常只研究社会较底层的阶级。
When scholars study marriage, they usually focus on white people, yet when they focus on African Americans, they usually study the lower classes.
全球范围内真正的断层线存在于一些国家的社会精英、中产阶级和金字塔底层人们之间，而且这种分化无处不在。
The planet's real fault line is between elites and the middle class in some countries, and the bottom of the pyramid, everywhere.
一个社会的中产阶级也许是整个社会状况的晴雨表，但一个社会如何对待它的底层民众才是衡量制度好坏的一个更好的指标。
A society's middle class may be the ultimate barometer for health, but how a society treats its lower class is a better indicator of overall virtue.
一个社会的中产阶级也许是整个社会状况的晴雨表，但一个社会如何对待它的底层民众才是衡量制度好坏的一个更好的指标。
A society's middle class may be the ultimate barometer for health, but how a society treats its lower class is a better indicator of overall virtue.
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