E, e
noun uk/iː/ us/iː/ Es, E's or es
(LETTER)
[ C or U ]（英语字母表的第五个字母）
the fifth letter of the English alphabet
(MUSIC)
[ C or U ]E 音;E 调
a note in Western music
The piece is in (the key of) E. 这支曲子是 E 调的。
The bottom string on a guitar is an E. 吉他的低音弦是发E音的。
(MARK)
[ C or U ]（表示学业成绩很差的）E 级
a mark in an exam or for a piece of work that shows the work is considered to be very bad or, in some situations, considered as a failure
You might have to take the course again if you get many more Es. 如果你这门课的成绩再继续是E级，就有可能必须重修。
(EAST)
[ U ]（east的缩写）
written abbreviation for east
(DRUG)
[ C or U ] informal摇头丸（ecstasy的缩写）
abbreviation for ecstasy
E, e
adjective uk/iː/ us/iː/
(EAST)
东的;东方的（east或eastern的缩写）
written abbreviation for east or eastern