/,pɒlɪ'staɪri:n; ,pɑlɪ`staɪrin/
n [U] type of light firm plastic with good insulating properties, used esp for making containers 聚苯乙烯
*[attrib 作定语] a polystyrene box 聚苯乙烯塑料盒.

n[U]
[Date: 1900-2000; Origin: poly- + styrene type of chemical compound (19-21 centuries) (from Latin styrax type of plant)]
BrE a soft light plastic material that prevents heat or cold from passing through it, used especially for making containers
= Styrofoam