每一段都用一个字母标记了。
图表中的字母标记为产品厚度代码。
不同尺寸的钩针是用字母标记。织针有数字。
Different sized crochet hooks are labeled with letters. Knitting needles have Numbers.
So, what happens here is this opening phrase, that we'll call A-- musicians like to label stuff just with alphabetical labels to keep it simple.
那么,首句这里,我们称作A,音乐家喜欢用字母,来做标记,这样比较简单
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