Lignin, which exists as highpolymer in plant, is a sort of environment friendly and reproducible natural resource, whose reserves in the world is next to cellulose.
木质素作为植物中蕴藏量仅次于纤维素的高聚物，是一种廉价易得，储量丰富，环境友好的可再生天然资源。
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Polymer: Natural or synthetic plastic-like substances having molecule in a high relative molecular mass formed by the chemical linking of many simple molecules, of the same substance.