regulater
(1)调整器，调节装置
(2)调压
(2)调速器

• Pechan prism
• pedal
• pedestal
• pedestal base
• peel
• peep hole
• peep sight
• peep-sight alidade
• peformance margin
• pellet
• pellet corona
• pellet electrode
• pellicle
• pellicle mirror
• pellicle reflector
• Pellin-Broca monochromator
• Pellin-Broca prsim
• pellucid
• pellucidity
• Peltier coefficient
• Peltier constant
• Peltier effect
• Peltier's element
• Peltier's heat
• penality function