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1. Oxford Dictionary

   invisible ink

   • n.
     a type of ink used to produce writing that cannot be seen until the paper is heated or otherwise treated.

   • noun: invisible ink, plural noun: invisible inks

2. • 更多解釋

   invisible ink

   • IPA[inˈvizəbəl iNGk]

   • n.
     a type of ink used to produce writing that cannot be seen until the paper is heated or ...

   Oxford American Dictionary