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1. Oxford American Dictionary

   guardrail

   • IPA[ˈɡärdrāl]

   美式

   • n.
     a rail that prevents people from falling off or being hit by something；a strong fence at the side of a road or in the middle of an expressway, intended to reduce the risk of serious accidents.

   • noun: guard rail, plural noun: guard rails

2. • 釋義

   n.

   名詞

   • 1. a rail that prevents people from falling off or being hit by something the top bunk has a solid guardrail
   • ▪ a strong fence at the side of a road or in the middle of an expressway, intended to reduce the risk of serious accidents.