1.(社會的)階級;社會等級[C][G]
They hope to win mass support among the middle class . 他們希望能贏得中產階級的廣泛支持。
2.等級制度[U]
3.班級;年級[C][G]
The class were/was interested in his lecture . 班上學生對他的講座都很感興趣。