polystyrene/ˌpɒliˈstaɪriːn; NAmEˌpɑːl-/ ( ˈStyrofoam™, especially in NAmE )
noun
[] very light soft plastic that is usually white, used for packing goods or for making containers that prevent heat loss聚苯乙烯◆They have stopped using polystyrene ‘peanuts’ for packing shipments.他们已停止使用聚苯乙烯“花生”包运货物。◆polystyrene cups聚苯乙烯杯➡ picture at packaging