problem

n.问题，疑难问题，须认真对付的困难

prizefighter, pro, pro forma, pro forma (also pro forma invoice), pro or con, pro rata, pro tem, pro-, probability, probable, probably, probate, probation, probation officer, probationary, probationer, probe, probing, probingly, probity, problem child, problematic, problematically, proboscis, procedural, procedure, proceed, proceeding, proceedings, proceeds, process, processing, procession, processional, processor, proclaim, proclamation, proclivity, procrastinate, procrastination,