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Market researchers often segment the population on the basis of age and social class.

市场研究人员常常按年龄和社会阶层划分人口。

《牛津词典》

An internal interaction might be initiated by an actor (if subsystem use cases are the basis for the interaction), but more likely it would be started by a generic class called Sender.

内部交互可能由参与者启动(如果子系统用例是交互的基础)，但它更可能是由叫作Sender的普通类启动的。

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This would put the middle class on a more equitable basis with the wealthy investor class.

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Obama is arguing for his activist agenda not on the basis of class consciousness, which is alien to America, but as a defense of middle-class morality, which is central to it.

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Those claims were the basis for five class-action lawsuits they brought against the company in the 2000s.

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