| 单词 | relief block | 
| 释义 | Definition of relief block in English:relief blocknoun Printing 
 OriginMid 19th century; earliest use found in Hogg's Weekly Instructor. Definition of relief block in US English:relief blocknoun Printing 
 OriginMid 19th century; earliest use found in Hogg's Weekly Instructor.  | 
	
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