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1. Oxford Dictionary

   countermark

   • IPA[ˈkaʊntəmɑːk]

   英式

   • n.
     an additional mark placed on something already marked, especially for increased security.；a second watermark.

   • noun: countermark, plural noun: countermarks

2. • 更多解釋

   countermark

   • IPA[ˈkoun(t)ərˌmärk]

   美式

   • n.
     an additional mark placed on something already marked, especially for increased security.

   Oxford American Dictionary