Though there are many suitable non-metals, plastics is the most important from design point of view. they are synthetic materials which can be moulded into desired shaped under pressure with or without application of heat. 翻译:有很多合适的非金属,从设计的角度出发,塑料并不是最重要的一种。它们是人工合成材料,加热后可以模铸成各种形状。