staining
(1)弄污
(2)着色(斑)，(玻璃)腐蚀斑

• Faraday rotation
• Faraday shutter
• faraday's law
• farady, pockel cells
• far field
• far field approximation
• far field construction
• far field diffraction
• far field pattern
• far infrared
• far-infrared
• far-infrared elelctronic transition
• far-infrared grating
• far-infrared laser pumping
• far-infrared lasers
• far-infrared masser
• far-infrared molecular laser
• far-infrared radiation
• far-infrared region
• far-infrared spectrophotomether
• far-IR interferoemeter
• far-off-axis anisotropic Bragg diffraction
• far point
• far-ranging
• far-red light