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Chitosan is the second polymer and its amount is only inferior to cellulose in nature, it is a good antimicrobial.
壳聚糖是自然界中产量仅次于纤维素的第二大天然高分子化合物，是一种高效的天然抗菌剂。
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The second layer is composed of a semiconducting polymer.
ECONOMIST: SEMICONDUCTORS: Move over, silicon | The
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