all a variation怎么理解
问题描述：
all a variation怎么理解
Nod factors are all a variation on a backbone of three to five β1-4-linked N- acetylglucosamine residues decorated with various chemical groups at the reducing or nonreducing ends
答
每个节点系数都是一个变量,表现在3-5个隆起处.β1-4链接着N个乙酰葡糖胺残渣,这些残渣是被各种化学群在减缩或非减缩的终端包裹着的.all a variation不能单独分离,而要和Nod factors are all a variation看成一个语言...