They are known as vitamins A, the B group,C,D,E and K.
VOA : special.2009.04.21
2
So they began to call this A and this B and this C and this D and this E, this F, this G.
他们开始把这叫做A,B和C,这个是D,E,F,G
聆听音乐课程节选 : 耶鲁公开课
3
These between B and C and E and F didn't get filled in because they were already just the smallest amount that they wanted to deal with, just half steps.