Polysaccharides are long linear or branched chains of monosaccharide units, which have a structural or storage role in the plant, since they tend to be insoluble and relatively unreactive.

• 多糖是由长链状或分枝状的单糖单元链构成的，在植物中具有储存和结构上的一些功能，它们一般不溶于水，相对不活泼。