polythene polyfoam lifejacket中文什么意思

• 聚乙烯泡沫塑料救生衣

• polythene:    n. 聚乙烯 (＝polyethyl ...
• polyfoam:    n. 泡沫塑料。
• polyvinyl chloride polyfoam lifejacket:    聚氯乙烯泡沫救生衣