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1. Oxford American Dictionary

   sac

   • IPA[sak]

   美式

   • n.
     a hollow, flexible structure resembling a bag or pouch；a cavity enclosed by a membrane within a living organism, containing air, liquid, or solid structures.

   • noun: sac, plural noun: sacs

2. • 釋義

   n.

   名詞

   • 1. a hollow, flexible structure resembling a bag or pouch a fountain pen with an ink sac
   • ▪ a cavity enclosed by a membrane within a living organism, containing air, liquid, or solid structures.
   • ▪ the distended membrane surrounding a hernia, cyst, or tumor.