材料代用必须经过设计单位和甲方同意并签证后，方可使用。
Material submission can't be used before designer and Party a have agreed and attested.
另外，在吸收消化引进国外技术基础上，结合国产材料代用，介绍几种关键部件的改进设计和应用。
Moreover, on the basis of digestion of imported technology and substitution with domestic material, design improvement and application of some key components are also introduced.
几十年来，赛璐璐一直在商业上充当龟甲、角、骨和其他材料的代用品。
Celluloid had been commercially available for decades as a substitute for tortoise-shell, horn, bone and other materials.
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