值得注意的是，调查人员对这两组儿童进行了仔细的比对，以便他们在年龄、民族、种族和社会阶层方面具有可比性。

It should be noted that the two groups of children had been carefully matched by the investigators so that they were comparable in age, ethnicity, race, and social class.

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与这一渐进进展同步的，我们还看到了一度难以想象的变化，这反映了人们态度上的变化，甚至在一些更为温和的社会阶层中也有这些变化。

In parallel with this gradual progress, we have seen once unimaginable changes which reflect a transformation in attitudes - even in the more moderate sections of society.

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Yet each of us will be confined it seems to only one task in the social hierarchy.

但我们每一个人都会被约束,这在社会阶层中看来似乎仅是一项任务。

耶鲁公开课 - 政治哲学导论课程节选