textbook

一个社会中具有某种共同特征（地位、身份、财产等）的社会集团

creed, doctrine, religious dogma

state, social class, degree, people, gradation, echelon, persuasion, position, order, class, remove, social status, notch, parity, social rank, sort, step, condition, rank, social station

比较实力的强弱或本领的高低

都, 都是（常用于书面语）