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      ratchet
      
	
      英 ['r?t??t]
美['r?t??t]

      


	    
      
	
        
    
      • n. 棘輪；棘齒
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      • vt. 安裝棘輪于；松脫
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      英英釋意
      
	
      
	
      1. mechanical device consisting of a toothed wheel or rack engaged with a pawl that permits it to move in only one direction