简要介绍了半纤维素的结构及其化学改性原理和方法，综述了近几年国内外半纤维素化学改性的研究状况；

The structure, principles and methods of chemical modification of hemicelluloses are briefly introduced, and the latest development of chemical modification of hemicelluloses is reviewed.

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也有的是纯粹的化学，将纤维素分解成一种氢和碳的气体混合物，然后再将其合成更为有用的东西。

And some go for pure chemistry, breaking the cellulose down into a gaseous mixture of hydrogen and carbon monoxide before building it back up into something more useful.

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众所周知，赛璐璐虽价格低廉，能仿制质量较好的传统材料，它却是取自化学处理的棉花和别的含有赛钱璃纤维素的蔬菜之中。

But celluloid, which had developed a reputation as a cheap mim-ic of better traditional materials, was de-rived from chemically treated cotton and other cellulose-containing vegetable matter.

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