zero material dispersion
无材料色散

• tridimensional
• triethanolamine
• trifocal
• trifocal spectacle
• trigger
• trigger electrode
• triggering system
• trigger pulse
• trigger reflector
• triglycine sulfate
• trigon
• trigonal
• trigonal crystal system
• trigonal symmetry
• trigonal system
• trigonometric[al]
• trigonometric calculation
• trigonometric function
• trigonometric leveling
• trigonometric ray-trace method
• trigonometric ray tracing
• trigonometric survey
• trigonometry
• tri-gun colo[u]r tube
• trihedral