ametropia-correcting lenses
校正屈光不正眼镜

• narrow-pulse
• nasopharyngoscope
• National Bureau of Standards
• National Science Foundation
• national standard
• natural
• natural abrasive
• natural aging
• natural colour film
• natural frequency
• natural light
• natural line width
• natural logarithm
• natural oscillation
• natural quartz
• natural scene illuminance
• natural source
• natural vibration
• natural wave
• natural width
• nature
• nature resonance
• nautical mile
• navar
• nave