问题描述：
请问我的这个有什么语法错误吗?帮忙改正下,
the primary structure of XG contains pentameric repeat units which was formed by two D-glucose,two D-mannose and one D-glucuronic acid.
Approximately onehalf of the terminals D-mannose contain a pyruvic acid residue linked via keto group to the 4 and 6 positions.这个句子有什么语法错误吗？
the primary structure of XG contains pentameric repeat units which was formed by two D-glucose,two D-mannose and one D-glucuronic acid.
Approximately onehalf of the terminals D-mannose contain a pyruvic acid residue linked via keto group to the 4 and 6 positions.这个句子有什么语法错误吗？
问题解答：
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