keelless 

  1. 形容詞
沒有龍骨的
(指鳥)沒有龍骨突起的

    
                        
    2. 
                                            

                

            

            
            

                

                
例句

                

                    
    
                                                    
  1. 
                                He reasoned that a keelless , or "ratite", sternum could easily evolve in unrelated birds that independently became flightless.                            
    2. 
                                                    
  2. 
                                The Cossacks' keelless rowing boats, called chaikas, could accommodate up to seventy men and outfitted with cannonades, the boats made formidable sea vessels.                            
    3.