a light, usually white plastic used especially for putting around delicate objects inside containers to protect them from damage, or for putting around something to prevent it from losing heat聚苯乙烯(泡沫塑料)
polystyrene cups/plates聚苯乙烯杯/盘
The ceiling was covered with polystyrene insulation tiles.天花板上覆盖着聚苯乙烯隔热瓦。