n.印度的世袭阶级；(排他的)社会团体；种姓；等级制度

Long had been in the process of the caste system which still exists today. 印度长久以来的世袭阶级今天仍然存在。

He came from the highest Hindu caste. 他出身印度最高的种姓。

The caste system is still strong in India. 种姓制度在印度仍然很牢固。

I suppose you also have a caste system in your society. 我想你们的社会里也有一种等级制度。