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n (pl D's, d's / di:z; diz/) 1 the fourth letter of the English alphabet 英语字母表的第四个字母: `David' begins and ends with a `D'/D. David一字的开头和结尾都是D. 2 D (music 音) the second note in the scale of C major C大调音阶中的第二音或音符. 3 D academic mark indicating a low standard of work 学业成绩为低等的评价符号.



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