名词
中文翻译：中产阶级
同义词：
['upper class', 'upper middle class', 'working class']
例句：
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1.The middle class is the largest group in society.
中产阶级是社会中最大的群体。
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2. Many people believe that the middle class is the backbone of society.
许多人认为中产阶级是社会的基础。
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3. The middle class has been a driving force behind economic growth in many countries.
中产阶级一直是许多国家经济增长的推动力。