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first hand observation meaning in English

实地观察

Related Words

  1. orbit observation
  2. ground observation
  3. meridian observation
  4. runway observation
  5. project observation
  6. direction observation
  7. observation place
  8. participant observation
  9. observation instrument
  10. systematic observation
  11. first hand knowledge
  12. first hand material
  13. first hand observations
  14. first hand tap
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