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fly ash noun

  /ˈflaɪ æʃ/ , /ˈflaɪ ˌæʃ/
  • A residue generated in the combustion of powdered coal or other materials, comprising the fine particles that rise with the flue gases; when generated industrially it is usually captured and can be recycled for use in construction materials.
 フライアッシュ
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