1. Exercise 3.4: Debrief the Exercise 
   练习3.4:汇报练习
2. opening speech; opening report 
   开题报告
3. opening and cleaning machine 
   开清机械
4. A piano exercise; a memory exercise. 
   钢琴练习；记忆练习
5. Exercise the back muscles; exercise the memory. 
   锻炼背部肌肉；训练记忆力

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• 1. 朝会
  露天学校 Open-air school; Fresh-air school...朝会 opening exercise...对比测验 Opposite test
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