| 单词 | Ramsden disc | 
| 释义 | Definition of Ramsden disc in English:Ramsden disc(US Ramsden disk) noun Optics 
 OriginEarly 20th century. Definition of Ramsden disc in US English:Ramsden disc(US Ramsden disk) noun Optics 
 OriginEarly 20th century.  | 
	
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