| 单词 | passage bed | 
| 释义 | Definition of passage bed in English:passage bednoun Geology 
 OriginMid 19th century; earliest use found in Quarterly Journal of the Geological Society of London. Definition of passage bed in US English:passage bednoun Geology 
 OriginMid 19th century; earliest use found in Quarterly Journal of the Geological Society of London.  | 
	
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