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1. Oxford American Dictionary

   master key

   • IPA[ˈmastər ˌkē]

   美式

   • n.
     a key that opens several locks, each of which also has its own key

   • noun: master key, plural noun: master keys

2. • 釋義

   n.

   名詞

   • 1. a key that opens several locks, each of which also has its own key the custodian has the master key to all the classrooms
3. • 更多解釋

   master key

   • IPA[ˈmɑːstə kiː]

   英式

   • n.
     a key that opens several locks, each of which also has its own key: the master key for all the safes in the department

   Oxford Dictionary