alphabetical

形容词 alphabetical:

1. relating to or expressed by a writing system that uses an alphabet
   同义词：alphabetic
2. arranged in order according to the alphabet
   同义词：alphabetic

1. You must arrange these books in alphabetical order.
   你要把这些书按字母顺序排好。
2. The words in the dictionary are arranged in alphabetical order.
   词典中的词是按字母顺序排列的。
3. The index is arranged in alphabetical order.
   这索引是按字母顺序排列的。