aplanatic lens
(1)消球差透镜
(2)齐明透镜

• Penning ionization
• Penning transfer
• pentaborate
• pentac lens
• pentaflex
• pentagon
• pentagonal aperture
• pentagonal prism
• pentagonal prisms
• penta mirror
• pentane
• pentane lamp
• pentaphosphate
• pentaprism
• penta reflector
• pentavalent
• pentode
• Pentovar lens
• pentoxide
• penumbra
• penumbra cone
• penumbra region
• perambulator
• percent
• percentage