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1. Oxford Dictionary

   yolk

   • IPA[jəʊk]

   英式

   • n.
     the yellow internal part of a bird's egg, which is surrounded by the white, is rich in protein and fat, and nourishes the developing embryo；the part corresponding to the yolk in the ovum or larva of all egg-laying vertebrates and many invertebrates.

   • noun: yolk, plural noun: yolks

2. • 釋義

   n.

   名詞

   • 1. the yellow internal part of a bird's egg, which is surrounded by the white, is rich in protein and fat, and nourishes the developing embryo two yolks a mass of yolk
   • ▪ the part corresponding to the yolk in the ovum or larva of all egg-laying vertebrates and many invertebrates.