中文字幕精品视频在线|中文字幕在线观看|亚洲v日本v欧美v在线播放|伊人网中文字幕

<nav id="3u6n6"></nav><samp id="3u6n6"><tr id="3u6n6"><track id="3u6n6"></track></tr></samp>
    <legend id="3u6n6"><fieldset id="3u6n6"></fieldset></legend>
      

      

      2. 
		
		
      
			
			
      
				
			
      
			
			
		
      
    
      
        
      
            
      
                
                    
      
	
      periodic
      
	
      英 [,p??r?'?d?k]
美[,p?r?'ɑd?k]

      


	    
      
	
        
    
      • adj. 周期的；定期的
        • 
    
      
	
      

      

    
      英英釋意
      
	
      
	
      1. happening or recurring at regular intervals
      

      2. recurring at regular intervals
      

      3. recurring or reappearing from time to time;
      "periodic feelings of anxiety"