plain flour
US /ˌpleɪn ˈflaʊər/
UK /ˌpleɪn ˈflaʊər/

1.
普通面粉, 中筋面粉
flour that does not contain a raising agent
:
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For this recipe, you'll need 2 cups of plain flour.
这个食谱你需要两杯普通面粉。
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She used plain flour to make the pastry light and flaky.
她用普通面粉制作酥皮,使其轻盈酥脆。