optical dat-transmission channel
光学数据传输信道

• re-entering
• reentrant
• reentrant acousto-optic light modulator
• reentrant angle
• reentrant deflecter
• refacer
• refacing
• refection-enhancing coating
• refection reducing coating
• reference
• reference angle
• reference area
• reference axis
• reference beam
• reference circuit
• reference colo[u]r
• reference direction
• reference disk
• referenced line of sight
• reference ga[u]ge
• reference generator
• reference level
• reference light
• reference line
• reference mark