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a1
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A1

 
pronunciation:
eI
phrases:
from A to Z
part of speech: noun
inflections: A's
definition 1: the first letter of the English alphabet.
英文字母表中第一个英文字母
definition 2: a grade given for excellent schoolwork.
优秀(学习成绩)
definition 3: the sixth note in the musical scale of C major.
C大调的第六音;A音
phrase: from A to Z