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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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Loại từ: noun
Từ đồng nghĩa:
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Ngành nghề/Lĩnh vực: Natural environment
Category: Climate change
Company: BBC
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Ngành nghề/Lĩnh vực: Fashion Category: Brands & labels

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A US retailer of premium quality women's fashion wear, lingerie and beauty products. Victoria's Secret is known for its annual fashion runway show, ...