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  1. Oxford Dictionary

    ultra-fine

    • adj.
      extremely fine in size, texture, composition, etc.
    • 釋義

    形容詞

    • 1. extremely fine in size, texture, composition, etc. ultra-fine particles which are invisible to the naked eye the sand is ultra-fine, like dust
    • 更多解釋

    ultra-fine

    • adj.
      extremely fine in size, texture, composition, etc.: the ultra-fine particles emitted by diesel vehicles the fiber in merino wool is ultra-fine

    Oxford American Dictionary