plane-table

n instrument used by surveyors for drawing plans in fieldwork, consisting of a circular table with a pivoted sighting-device 平板仪.

plain clothes (esp of police officers), plain dealing, plain flour, plain-clothes man, plain-spoken, plainchant, plainly, plainness, plains, plainsman, plaint, plaintiff, plaintive, plaintively, plaintiveness, plait, plan, plane, plane geometry, plane sailing, planet, planetarium, planetary, plangency, plangent, plangently, plank, planking, plankton, planned, planning, plant, plantain, plantation, planter, plaque, plasma, plaster, plaster cast, plasterboard,