| 单词 | D |
| 释义 | noun | DD1, d /di/ noun (plural D’s, d’s) 1[countable] a)the fourth letter of the English alphabet b)a sound represented by this letter2eng. lang. arts a)[countable, uncountable] the second note in the musical scale of C major b)[uncountable] the musical key based on this note3[countable] a grade that a teacher gives to a student’s work, showing that it is not very good and just above the point of failing noun | DD2 1the number 500 in the system of roman numerals2used to show that a television program contains conversations about sex → see also D and C, D-Day |
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