exercise的用法

讨论议题:exercise的用法
本议题来自课程共(9节):
  1. 2.3 Exercise
  2. 3.3 Exercise
  3. 4.3 Exercise
  4. 5.3 Exercise
  5. 1.3 Exercise
  6. 6.3 Exercise
  7. 7.3 Exercise
  8. 8.3 Exercise
  9. 9.3 Exercise
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