D, d /dk; di/ (pl D's, d's) /di: z; diz/ the fourth letter of the English alphabet; Roman numeral for 500. 英文字母的第四個字母; 羅馬數(shù)字的 500。'd, used for had or would (esp after 1, we, you, he, she, they, M。). 尤在 I, we, you, he, she, they, who 各孚之后, 'd 用以代替 had 或 wouldo