名詞 leavening:

1. an influence that works subtly to lighten or modify something
   同義詞：leaven
2. a substance used to produce fermentation in dough or a liquid
   同義詞：leaven

動詞 leaven:

1. cause to puff up with a leaven
   同義詞：raise, leaven, prove

1. A small cake of shortened bread leavened with baking powder or soda.
   餅干由烘烤劑或蘇打發(fā)酵制成的松脆的小塊點心
2. A leavened rum cake, usually made with raisins.
   蘭姆糕一種發(fā)酵的蘭姆酒蛋糕，一般用葡萄干制成
3. We often use leaven when baking breads.
   烤面包時，我們經(jīng)常使用發(fā)酵劑。

leav.en.ing

n.（名詞）
An agent that causes rising, fermentation, or ferment; leaven.See Synonyms at catalyst
發(fā)酵劑：導(dǎo)致突起、發(fā)芽或發(fā)酵的制劑；發(fā)酵劑參見 catalyst