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1. Oxford American Dictionary

   gateway drug

   • IPA[ˈɡātwā ˌdrəɡ]

   美式

   • n.
     a habit-forming drug that, while not itself addictive, may lead to the use of other addictive drugs

   • noun: gateway drug, plural noun: gateway drugs

2. • 釋義

   n.

   名詞

   • 1. a habit-forming drug that, while not itself addictive, may lead to the use of other addictive drugs many believe that alcohol and cigarettes are gateway drugs that increase the risk of subsequent involvement with illegal drugs