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observation opening meaning in English

观察孔

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. observation of the work
  12. observation of volcanoes
  13. observation pairs
  14. observation panel
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