spatial frequency discrimination
空间频率鋻别

• pendulous
• pendulous gyroscope
• pendulum
• penertrating radiatio
• penetrability
• penetrating power
• penetrating wave
• penetration
• penetration frequency
• penetration of current
• penetraton depth
• penetrometer
• penetron
• penlight
• Penning effect
• Penning ionization
• Penning transfer
• pentaborate
• pentac lens
• pentaflex
• pentagon
• pentagonal aperture
• pentagonal prism
• pentagonal prisms
• penta mirror