Polystyrene foam is a manufactured plastic primarily made up of rings of carbon and hydrogen, called phenyl groups, attached to long hydrocarbon chains that can break into smaller styrene units.

• 聚苯乙烯泡沫塑料是一种加工塑料，主要由被称作苯基团的碳环和氢环构成，苯基团连接到能降解成更小苯乙烯单元的长链碳氢化合物上。