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1. Oxford American Dictionary

   proving ground

   • IPA[ˈpro͞oviNG ˌɡround]

   美式

   • n.
     an environment that serves to demonstrate whether something, such as a theory or product, really works；a military facility for the testing of materiel and equipment

   • noun: proving ground, plural noun: proving grounds

2. • 釋義

   n.

   名詞

   • 1. an environment that serves to demonstrate whether something, such as a theory or product, really works Bay County is the proving ground for a new gutter-cleaning vacuum
   • ▪ a military facility for the testing of materiel and equipment Aberdeen Proving Ground