prism

n.棱镜

principal, principal boy, principal parts, principality, principally, principle, principled, print, printable, printed circuit, printed matter (also ,printed `papers), printer, printing, printout, prior, prior to, priority, priory, prise, prise (also esp US prize), prismatic, prison, prison camp, prisoner, prissily, prissiness, prissy, pristine, privacy, private, private company, private enterprise, private eye, private member, private parts, private soldier, privateer, privately, privation, privatization, privatisation,