- beam reversing lens
- 光束: light beam a surname
- 返回: return; go back; revert; rec ...
- 透镜: lens; optical lens
- 返回: return; go [come] back; revert; recurrence; throwback 返回港口 put back to port; 返回原地 return to the starting point; 使人造地球卫星返回地面 recover a man-made earth satellite
- 光束: light beam; light pencil; luminous flux; pencil; stricture
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