B, b
noun uk/biː/ us/biː/ Bs, B's or b's
(LETTER)
[ C or U ]（英语字母表的第二个字母）
the second letter of the English alphabet
(MUSIC)
[ C or U ]B 调，B 音
a note in Western music
Bach's Mass in B minor 巴赫B小调弥撒曲
(MARK)
[ C or U ]（学业成绩、工作表现的）良好，第二等
a mark in an exam or for a piece of work that shows that your work is good but not excellent
I was a little disappointed just to be given a B, as I was hoping for an A. 得了“良好”我感到有点沮丧，我一直希望得“优秀”。
I got B for physics last term. 上学期我的物理成绩得了“良好”。