exercise可数吗

讨论议题:exercise可数吗
本议题来自课程共(7节):
  1. 2.3 Exercise
  2. 4.3 Exercise
  3. 1.3 Exercise
  4. 6.3 Exercise
  5. 7.3 Exercise
  6. 8.3 Exercise
  7. 9.3 Exercise
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