a middle-class attitude的用法和样例：
- He made a bid for middle class support.
- A middle class Chinese family and their two servants, standing in front of their Chungking home.
- A person belonging to the middle class.
- They were married in 1933, but Dagwood's parents disapproved of Blondie and disinherited him, forcing him to go to work and live a middle class life.
- The belief was that rising incomes would create a middle class that would agitate for personal liberty and political power.