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1. Oxford Dictionary

   permanent magnet

   • n.
     a magnet that retains its magnetic properties in the absence of an inducing field or current.

   • noun: permanent magnet, plural noun: permanent magnets

2. • 更多解釋

   permanent magnet

   • IPA[ˈpərm(ə)nənt ˈmaɡnət]

   • n.
     a magnet that retains its magnetic properties in the absence of an inducing field or current.

   Oxford American Dictionary