| 单词 | roller beam | 
| 释义 | Definition of roller beam in English:roller beamnoun Manufacturing Technology 
 OriginEarly 19th century; earliest use found in The Repertory of Arts. Definition of roller beam in US English:roller beamnoun Manufacturing Technology 
 OriginEarly 19th century; earliest use found in The Repertory of Arts.  | 
	
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