... unmanaged ecosystem没管理的生态系统 unplasticized poly（vinyl chloride）未增塑聚氯乙烯 unplasticized PVC未增塑聚氯乙烯 ...
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Unplasticized poly sheets 未增塑聚氯乙烯薄板
Unplasticized Poly Vinyl Chloride 目的通过对硬聚氯乙烯 ; 通过对硬聚氯乙烯
unplasticized poly
unplasticized聚
以上为机器翻译结果，长、整句建议使用 人工翻译 。
Plastics piping systems for buried and above-ground drainage and sewerage under pressure - Unplasticized poly (vinyl chloride) (PVC-U) - Part 1: specifications for piping components and the system.
地下和地上排水和排污用塑料压力管道系统。未增塑聚氯乙烯(PVC - U)。第1部分：管道件和系统规范。
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