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 alphabet.
【词汇突破】discrimination：歧视
alphabet：字母表
【主干识别】This refers to discrimination against those加定语从句
【其他成分】for those as yet unaware of such a disadvantage：插入语，可改写为：for those who are unaware of such a disadvantage as yet理解起来会方便很多；as yet至今；whose surnames begin with a letter in the lower half of the alphabet定语从句。
【微观解析】若是对于句中的插入语理解起来有困难，不妨试着改变它的句式结构，将长定语还原为定语从句，而这种方法的逆向思维可以与写作相结合，使文章的句式更加灵活多变。
【难点揭秘】较长插入语的出现会混淆视听，不容易把握主干。
【译文赏析】对于那些还不了解这种危害的人来说，它指的是对姓氏首字母位于字母表后半部分的人的歧视
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