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  1. Oxford Dictionary

    fastness

    • IPA[ˈfɑːs(t)nəs]

    英式

    • n.
      a secure place well protected by natural features；the ability of a material or dye to maintain its colour without fading or washing away

    • noun: fastness, plural noun: fastnesses

    • 釋義

    名詞

    • 1. a secure place well protected by natural features a remote Himalayan mountain fastness
    • 2. the ability of a material or dye to maintain its colour without fading or washing away the dyes differ in their fastness to light