1. a thin crisp wafer made or flour and water with or without leavening and shortening; unsweetened or semisweet. 面粉和水做成的、发酵或不发酵、酥松或不酥松的薄脆饼干；未加糖或半甜。
2. Among the cadres, however, there was a leavening of older, resolute men and also a bitter group of young peasant boys with some education who took the lead in the fight on the landlords. 然而在干部队伍中，也有不少久经考验、立场坚定的老干部，还有一批具有一定文化的农民子弟，他们是领导这场运动的中坚力量。
3. 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. 发酵粉（饼）：一种粉状或饼状的商业制剂，含有酵母细胞和惰性物质，如玉米粉，专门用作发酵剂或饮食的补充物。
英英解释
n.
1. an influence that works subtly to lighten or modify something
2. a substance used to produce fermentation in dough or a liquid
