This, for those as yet unware of such a disadvantage

This, for those as yet unware of such a disadvantage, refers to discrimination against those whose surnames begin with a letter in the lower half of the alphabet
这个长难句的主干书上说是This refers to discrimination against those +定从,请问这个主干的结构是什么?谓语是refers to,还是against?

1. for those as yet unware of such a disadvantage 是插入语

2.This 是主语， refers to是谓语

3. those whose surnames begin with a letter in the lower half of the alphabet 是定语从句
those 是先行词， whose 是关系词，“那些/姓的/第一个字母/排在字母表后半部分/的人”

4.这句的主干就是This refer to discrimination against those……

5.“对于那些还不知道（一个人的姓会造成的）这个劣势的人来说，这个就是对那些名字中姓的第一个字母排在字母表后半部分人的歧视/不公平对待” (翻成"歧视"好像有点过了)

这个是不是出自某篇阅读理解？我以前好像做过。

谓语是refers to ，against 是介词在这里做discrimination的定语。

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