exercise是什么意思

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