perpetual

a.永久的；持久的

permission, permissive, permissively, permissiveness, permit, permutation, permute, pernicious, pernicious anaemia, perniciously, perniciousness, pernickety, peroration, peroxide, perpendicular, perpendicularity, perpendicularly, perpetrate, perpetration, perpetrator, perpetual motion, perpetually, perpetuate, perpetuation, perpetuity, perplex, perplexed, perplexedly, perplexing, perplexity, perquisite, perry, pers, persecute, persecution, persecutor, perseptive, perseverance, persevere, persevering,