通过从天然来源，如木材，被囊动物(海参类)和某些种类的细菌中提取纤维素，研究人员可以制备不同尺寸和强度的晶体。

Deriving cellulose from natural sources such as wood, tunicate (ocean-dwelling sea cucumbers) and certain kinds of bacteria, researchers prepare crystals of different sizes and strengths.

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海参是我国传统补益药，其中含有多种生物活性成分，如皂甙类和粘多糖类。

Sea cucumber is one of restoratives in traditional Chinese drug. It contains many biological active components, such as saponins and mucopolysaccharides.

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