The middle is plastic board made of “PS”, Out layer is foam ,outermost lay
（产品）的中间是由聚苯乙烯材料制作的胶板,外层是泡沫做的,排列在最外边.
坦白说
outermost lay译得不是很有把握. 可能是专业用语.
The middle is plastic board made of “PS”,Out layer is foam ,
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