extraordinary index of refraction
非常折射率

• duration of exciting
• duration of vision
• durometer
• dust
• dust cap
• dust chamber
• dust chatcher
• dust cleaner
• dust clollector
• dust counter
• dust cover
• duster
• dust-free
• dust-free area
• dust guard
• dust-proof
• dust ring
• duty cycle
• duty factor
• DVD-ROM drives
• DVD-ROMs
• DWDM
• DWDM Dense Wavelength Division Multiplexer
• dwell
• dye