Styrofoam
noun [ U ] US trademark uk/ˈstaɪ.rə.fəʊm/ us/ˈstaɪ.rə.foʊm/
聚苯乙烯泡沫塑料
a brand name for a type of polystyrene (= 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)