air-glass reflection
空-玻璃界面反射

• r.m.s roughness
• road level
• robot
• robotization
• Rochon prism
• rochon prismsRochon
• rock crystal
• rocker
• rocker arm
• rocket
• rocket-borne
• rocketry
• rocking grating
• rocking grating spectrometer
• rocksalt
• Rockwell hardness tester
• rock wool
• rod
• rod guide
• rod of the retina
• rod radiator
• rod-shaped flash lamp
• rod vision
• roentgen
• roentgengraphy