roughen 

  1. 動詞
不及物動詞:
變粗糙
變崎嶇不平
及物動詞:
使...(物)粗糙
使...(物)崎嶇不平
/此動詞過去式與過去分詞為"roughened"/
/現在分詞為"roughening"/
/第三者單數現在式為"roughens"/

    
                        
    2. 
                                            

                

            

            
            

                

                
例句

                

                    
    
                                                    
  1. 
                                Use sandpaper to roughen the bottom end of the egg.                            
    2. 
                                                    
  2. 
                                The way around for me was to roughen up the shafts with a saw .                            
    3. 
                                                    
  3. 
                                Pits and fissures are acid etched to roughen the enamel surface.                            
    4. 
                                                    
  4. 
                                Roughen the surface of the tube around the hole with emery paper.                            
    5. 
                                                    
  5. 
                                One should redefine simply contrasted or roughen to describe an erection.                            
    6.