The reason is simple - I believe that things can be easily memorized in an alphabetic order.
原因其实也很简单，按字母顺序，我们记起来容易些。
Words are listed in alphabetic order in the dictionary.
单词在字典里是以字母顺序排列的。
The books are arranged on the shelves in alphabetic order.
书架上的书是按字母顺序排列的。
The books are arranged on the shelves in alphabetic order.
书架上的书是按字母顺序排列的。
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