class system​
身分制度
social class
/suto3/google.iconclass system
/suto3/Google画像検索.iconclass system
/suto3/Google定義検索.icon class system
/suto3/wikipedia.iconclass system
/suto3/weblio.icon class system
/suto3/kotobank.icon class system
/suto3/jisho.icon class system