polimer

polimer

A polymer is a giant molecule made up of thousands of atoms. It can be natural or man-made (synthetic). Many plastics in everyday use are polymers, such as polythene or PVC; but then so is cellulose, which makes up wood pulp from which paper is manufactured.

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行业/领域：自然环境
类别气候变化
Company: BBC
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salmon

A meaty fish with firm, flavorful flesh. High in protein, the meat is an excellent source of Omega-3 fatty acids. It can often be found on our fresh ...