名詞 yeast:

1. a commercial leavening agent containing yeast cells; used to raise the dough in making bread and for fermenting beer or whiskey
   同義詞：barm
2. any of various single-celled fungi that reproduce asexually by budding or division

1. Bread is raised with yeast.
   面包使用酵母就會膨起。
2. Made light and high by yeast or other leaven.
   發(fā)酵的用酵母或其它發(fā)酵劑使 ... 輕而高
3. Yeast must be used in producing wine.
   制酒時必須使用酵母菌。

yeast

n.（名詞）

Any of various unicellular fungi of the genusSaccharomyces, especially S. cerevisiae, reproducing by budding and from ascospores and capable of fermenting carbohydrates.
酵母菌：一種酵母菌 屬的單細胞真菌，尤指 S.cerevisiae ，通過發(fā)芽和從子囊孢子生殖，能夠發(fā)酵成碳水化合物
Any of various similar fungi.
酵母：一種類似的真菌
Froth consisting of yeast cells together with the carbon dioxide they produce in the process of fermentation, present in or added to fruit juices and other substances in the production of alcoholic beverages.
發(fā)酵劑：一種由酵母細胞及其在發(fā)酵過程中產生的二氧化碳組成的泡沫，它們存在于或被加入果汁或其它用來制造酒精飲料的物質中
A commercial preparation in either powdered or compressed form, containing yeast cells and inert material such as meal and used especially as a leavening agent or as a dietary supplement.
發(fā)酵粉（餅）：一種粉狀或餅狀的商業(yè)制劑，含有酵母細胞和惰性物質，如玉米粉，專門用作發(fā)酵劑或飲食的補充物
Foam; froth.
泡沫，泡
An agent of ferment or activity:
激動：騷動或活動的動因：
例句：
political agitators who are the yeast of revolution.See Synonyms at catalyst
激起革命的政治鼓動者參見 catalyst

v.intr.（不及物動詞）
yeast.ed,yeast.ing,yeasts
To ferment.
發(fā)酵
To froth or foam.
起泡沫

來源：
Middle English yeest
中古英語 yeest
from Old English gist * see yes-
源自 古英語 gist *參見 yes-