The poem is about the dream of a world free of inequality and racial prejudice.

prejudice 是名词，意思是“偏见、成见”，指基于不充分或错误的信息对某人或某群体形成的先入为主的负面看法。它由前缀 pre-（在……之前）和词根 judice（判断，来自拉丁语 judicium）组成，字面意思是“预先判断”，即未经了解就下结论。