时尚可以随着时间的推移根据社会中年龄、社会阶层、辈分、职业和地理发生明显的变化。
Fashions may vary significantly within a society according to age, social class, generation, occupation and geography as well as over time.
第六章是城市人口和社会阶层的变化。
Chapter VI: The Change of City Population and Social Strata.
当然，中国现阶段社会阶层结构还处在不断的变化和调整中。
Certainly, the social stratum's structure is still changing and adjusting constantly at the present stage in China.
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