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1. Oxford American Dictionary

   lifebuoy

   • IPA[ˈlīfˌboi]

   美式

   • n.
     a life preserver, especially one in the shape of a ring.

   • noun: lifebuoy, plural noun: lifebuoys

2. • 更多解釋

   lifebuoy

   • IPA[ˈlʌɪfbɔɪ]

   英式

   • n.
     a buoyant support such as a lifebelt for keeping a person afloat in water.

   Oxford Dictionary