stain
(1)污点，污斑
(2)锈
(3)彩色
(4)着色剂，染色剂

• photoactor
• photoalidade
• photoammeter
• photoamplifier
• photoanalysis
• photoassciation
• photobattery
• photo-beat
• photo-behavior
• photobiology
• photobleaching
• photocamera
• photocarrier
• amplitude-modulated signal
• Amplitude Modulation
• amplitude object
• amplitude range
• amplitude spectrum
• amplitude splitting
• amplitude spread function
• amplitude stabilized laser
• amplitude transfer function
• amplitude transmittance
• amplitude vector
• Am-Pm conversion