这个原始的管状结构，由纤维素和非纤维物质构成，称作初生层。

This initial layer formed of both cellulosic and non cellulosic materials is called the primary wall.

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这个原始的管状结构，由纤维素和非纤维物质构成，称作初生层。

This initial layer, formed of both cellulosic and noncellulosic materials, is called the primary wall.

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膳食纤维是指植物性食品中不能被人类胃肠道所消化的糖类物质，包括非淀粉类多糖和木质素。

Dietary fiber including non starch polysaccharide and lignin is the carbohydrate substances contained in plant foods which can not be digested by human digestive system.

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