| 单词 | backwash ripple mark | 
| 释义 | backwash ripple mark [`bak´wäsh `rip·ǝl ´märk]  GEOLOGY Ripple marks that are broad and flat and parallel to the shoreline, with narrow, shallow troughs and crests about 30 centimeters apart; formed by backwash above the maximum wave retreat level.  | 
	
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