第331句
Over the past century, all kinds of unfairness and discrimination have been condemned or made illegal. But one insidious form continues to thrive: alphabetism. This, for those as yet unaware of such a disadvantage, refers to discrimination against those whose surnames begin with a letter in the lower half of the alpbabet.
译文：在过去的一个世纪里，各种各样的不公正和歧视遭到了谴责或被判定为非法。但是有一种隐蔽形式的不公正和歧视还在蔓延，即按字母表顺序排名。对于尚未意识到其危害的人来说，它指的是对那些姓氏首字母位于字母表后半部分的人受到的歧视。
点睛：在第一句中，句子的主干为…all kinds of unfairness and discrimination have been condemned or made illegal…。Over the past century作时间状语，and连接两个并到主语，由or连接并列谓语have been condemned和made，illegal是主语补足语。第二句结构简单，注意冒号后的alphdbetism是该句主语form的同位语，说明这种隐蔽形式的歧视是什么。第三句的主干为This…refers to discrimination…，在主语this和谓语refers to之间的部分是插入语，而定语从句whose surnames begin with a letter in the lower half of the alphabet用来修饰those。