but·ter·milk /ˈbʌtɚ/
  白脫牛奶,酪漿
  but·ter·milk /ˈbətɝˌmɪlk/ 名詞
  酪乳
  But·ter·milk n. The milk that remains after the butter is separated from the cream.
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  buttermilk
       n : residue from making butter from sour raw milk; or
           pasteurized milk curdled by adding a culture