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   ultrafine

1. Oxford Dictionary

   ultra-fine

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

   adj.

   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
3. • 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