sourdough
noun [ U ] uk/ˈsaʊə.dəʊ/ us/ˈsaʊr.doʊ/
酵头(发酵用的含酵母面团)
a mixture of flour and water that is left to ferment (= change in a chemical process) and then used to make bread
sourdough bread 用面肥发的面包
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