three-dimensional imaging
三维成像，立体成像

• universal stage
• universal stand
• universal theodolite
• universal type
• univibrator
• univoltage lens
• unknown
• unlimited exposure
• unmagnetized
• unmoderated
• unmodulated
• unoccupied level
• unpacking
• unperturbed
• unplugged
• unpolarized
• unpolarized light
• unpredictability
• unquantized
• unreflected
• unrelated colo[u]r
• unreliability
• unresolved lines
• unresonant system
• unsaturation