perpendicular

a.垂直的

permeability, permeable, permeate, permeation, permissible, permissibly, permission, permissive, permissively, permissiveness, permit, permutation, permute, pernicious, pernicious anaemia, perniciously, perniciousness, pernickety, peroration, peroxide, perpendicularity, perpendicularly, perpetrate, perpetration, perpetrator, perpetual, perpetual motion, perpetually, perpetuate, perpetuation, perpetuity, perplex, perplexed, perplexedly, perplexing, perplexity, perquisite, perry, pers, persecute,