I actually don't want to be a middle-of-the-road person, married with a mortgage.

我真的不想作一个平庸的人，结完婚，背着抵押贷款。

《柯林斯英汉双解大词典》

Ideas about social class—whether a person is "working-class" or "middle-class"—are one area in which changes have been extremely slow.

关于社会阶级的观念，判断一个人是“工人阶级”还是“中产阶级”，这是一个极其缓慢的变化过程。

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Though a middle-class person may "want to live like common people"， they can never appreciate the reality of a working-class life.

虽然一个中产阶级可能“想要像普通人一样生活”，但他们永远不会领会到工薪阶层生活的真相。

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Advocates say that with every iPod-wearing middle-class person who shows up, the homeless are being pushed further to the margins.

NPR: Redevelopment in L.A. Affects Homeless Population

They are no longer concerned even with satisfying the customer (who generally is not somebody whom he runs in the same social circles with, but instead is a regular middle-class person).

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The Shenzhou-9 mission will launch sometime in the middle of June and carry a three-person crew.

FORBES: China To Launch Manned Docking Mission Later This Month