periods ['pɪrɪrdz]

例句:

• The training covers extended periods in obstetrics and gynaecology.
  该培训包括产科学和妇科学的增加课时。
  
• Values from some funds are based upon prior periods.
  来自WSJ
• I used to write during my free periods at school.
  过去我经常在课余时间写作。
  
• He has spent periods in prison, where he was gruesomely tortured.
  他坐过几次牢，在牢里受到非人的折磨。
  
• Some dreams we remember for long periods of time.
  来自SA
• Both nurses were working in casualty during those periods.
  来自THETIMES