collecting lens
(1)聚光镜，集光透镜
(2)透场透镜

• 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
• pinch laser
• pinch-off effect
• pinch-off voltage
• pinch plasma
• pinch-preheated
• pinch pump
• pin clamp
• pincushion aberration
• pincushion distortion
• pincushion-shaped image