optically thinner medium
光疏媒质

• piezo-optical property
• piezoquartz
• piezoresistance
• piezoresistive
• piezoresistor
• pig iron
• pigment
• pigment epithelium
• pile-of-plates polarizer
• pile-up
• pillar
• pillbox antenna
• pillbox distribution
• pillow
• pilot ballon theodolite
• pilot lamp
• pilot light
• pilot wave
• pimpling
• pin
• pinacoid
• pin-camera
• pinch
• pinch-discharged-pumped laser
• pinch effect