periodic [ˌpɪriˈɑ:dɪk]

例句:

• These arrangements are subject to periodic reviews.
  这几项安排须定期检查。
  来自《权威词典》
• The bank makes periodic payments to the CDS seller.
  来自BBC
• There may be periodic police "sweeps" of crime in the area.
  警方可能对该地区的犯罪活动进行定时的“扫荡”。
  
• Periodic checks are carried out on the equipment.
  设备定期进行检查。
  
• Long long ago, we knew the periodic motion of a planet.
  很久以前, 我们就知道行星的周期运动.
  
• Lemming populations also undergo periodic boom and bust cycles.
  来自BBC
• Carbon is the sixth element in the periodic table.
  来自SA
• Long long ago,we knew the periodic motion of a planet.
  很久以前，我们就知道行星的周期运动。
  来自《权威词典》