请问下面的英文句子有语法错误吗?如果有帮忙改正下,Xanthan gum (XG),discovered by the Northern Regional Research Laboratories (NRRL) of the United States Department of Agriculture,is a complex non-linear anionic microbial exo-poly

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请问下面的英文句子有语法错误吗?如果有帮忙改正下,Xanthan gum (XG),discovered by the Northern Regional Research Laboratories (NRRL) of the United States Department of Agriculture,is a complex non-linear anionic microbial exo-poly
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请问下面的英文句子有语法错误吗?如果有帮忙改正下,Xanthan gum (XG),discovered by the Northern Regional Research Laboratories (NRRL) of the United States Department of Agriculture,is a complex non-linear anionic microbial exo-poly
请问下面的英文句子有语法错误吗?如果有帮忙改正下,
Xanthan gum (XG),discovered by the Northern Regional Research Laboratories (NRRL) of the United States Department of Agriculture,is a complex non-linear anionic microbial exo-polysaccharide.

请问下面的英文句子有语法错误吗?如果有帮忙改正下,Xanthan gum (XG),discovered by the Northern Regional Research Laboratories (NRRL) of the United States Department of Agriculture,is a complex non-linear anionic microbial exo-poly
没有语法错误.
句子结构：主系表
主语：Xanthan gum
系动词：is
表语：a complex ...exo-polysaccharide
过去分词短语 discovered by ...作定语,修饰Xanthan gum,不需要was.
如果改为定语从句,则需要was,即：Xanthan gum,which was discovered by ...Agriculture,is a ...
句子意思：
由美国农业部北部地区研究所（NRRL）发现的三仙胶（XG）是一种复杂的阴离子微生物胞外多糖.
注：
Xanthan gum “黄原胶”（音译作三仙胶）,俗称玉米糖胶、汉生胶,是一种糖类经由野油菜黄单胞菌发酵产生.

大意了~自删..

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