F, f
noun uk/ef/ us/ef/ Fs, F's or f's
(LETTER)
[ C or U ]（英语字母表的第六个字母）
the sixth letter of the English alphabet
(MUSIC)
[ C or U ]F 音
a note in Western music
The song is in (the key of) F. 这首歌是F调的。
Play an F followed by a G. 弹F音键后再弹G音键。
(TEMPERATURE)
[ after noun ]华氏的;华氏温标（Fahrenheit的缩写）
abbreviation for Fahrenheit
Yesterday the temperature was 90°F. 昨日气温为90华氏度。