这本教科书中说说明性材料多于范文，所以难以阅读。
They textbook contains more explanatory material than models and is therefore hard to plough through.
为使我公司对你们的产品有全面的了解，请寄产品目录等相关说明性文字材料。
To acquit us with your products, please forward catalogue and other relative descriptive literatures.
为使我公司对你们的产品有全面的了解，请寄产品目录等相关说明性文字材料。
To acquit us with your products, please forward catalogue and other relative descriptive literatures.
应用推荐