permanent way

(Brit) railway track, ballast and sleepers on which the track is laid 铁路钢轨; 铁路路基.

perishables, perished, perisher, perishing, peristyle, peritonitis, periwinkle, perjure, perjurer, perjury, perk, perkily, perkiness, perky, perm, permafrost, permanence, permanency, permanent, permanent wave, permanently, permanganate, permeability, permeable, permeate, permeation, permissible, permissibly, permission, permissive, permissively, permissiveness, permit, permutation, permute, pernicious, pernicious anaemia, perniciously, perniciousness, pernickety,