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