They are made of a rigid material, like plastic, but some are made of leather or other soft materials.
矫正鞋垫通常由刚性材料，比如塑料、但也有些用皮革或其他柔软的材料做成的。
Another kind is thermoplastic polystyrene foamed plastic thermosetting and rigid polyurethane foams primarily organic heat preservation material, usually identified as combustible materials.
另一类是以热塑性聚苯乙烯泡沫塑料和热固性聚氨酯硬泡为主的有机保温材料，通常认定为可燃性材料。
The basic relationship of plastic mechanics of the rigid plastic compressible material under non-principal axis condition was finalized through two different approaches.
本文从两个不同的途径证明了刚塑性可压缩材料在非主轴条件下的塑性力学基本关系式。
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