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1. Oxford American Dictionary

   fastness

   • IPA[ˈfastnəs]

   美式

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

   • noun: fastness, plural noun: fastnesses

2. • 釋義

   n.

   名詞

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