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BNC: 5229 COCA: 10292

a chemical substance consisting of large molecules made from many smaller and simpler molecules聚合物,聚合体

Many polymers, such as nylon, are artificial.许多聚合物是人造的,比如说尼龙。
Proteins and DNA are natural polymers.蛋白质和脱氧核糖核酸都是天然聚合体。

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