関連ワード:  working class vs middle class vs upper class    lower class vs middle class vs upper class    low class vs middle class vs high class    working class middle class and upper class    lower class middle class and high class    difference between working class and middle class and upper class    lower class middle class and higher class    lower class middle class and upper class    lower class middle class and upper class salary    middle.class vs working class  
結果 : working class vs middle class vs high class