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
you can look on your notes, C it also says structure a, b, and c on your notes, so you didn't need to have just memorized that slide.
大家可以看你们的讲义,讲义上也把它们叫做结构,A,B,和,因此大家不需要去记那张幻灯片。
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