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N-VAR
英语字母表的第 4 个字母
D is the fourth letter of the English alphabet.
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N-VAR
C 大调音阶中的第二音;D 音
In music, D is the second note in the scale of C major.
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N-VAR
(作业、考试成绩等的)丁等，D等，差
If you get a D as a mark for a piece of work or in an exam, your work is below average or poor.
例句
I got a D+.
我得了个 D+。
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(用于墓碑上或工具书中等的日期前)
d. is an abbreviation for (缩略=) died when it is written in front of dates, for example on graves or in reference books.
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(英国1971年前使用的旧制辅币)
d was a written abbreviation for (书面缩略=)penny or pence in Britain before decimal currency was introduced in 1971.
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(用于首字母为 d 的一些单词的缩写，如 day, defeated或district）
D or d is used as an abbreviation for words beginning with d, such as 'day', 'defeated', or 'district'.