leaven的过去式 leaven的过去式是什么

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

   "his sermons benefited from a leavening of humor"
   

1. cause to puff up with a leaven;

   "unleavened bread"
   

1.给…添趣；为…增色；使生动
If a situation or activityis leavened by orwith something, it is made more interesting or cheerful.

e.g. His mood of deep pessimism cannot have beenleavened by his mode of transport—a black cab...
他极度悲观沮丧，而他的代步工具——一辆黑色的出租车，丝毫不能舒缓这一情绪。
e.g. He found congenial officers who knew how toleaven war's rigours with riotous enjoyment.
他找到了懂得用狂欢来冲淡战争的严酷的志趣相投的军官。

• of the same leaven同类的,同一性质的...
• the old leaven尚未革除的旧影响力...

• You are to be that vitally active leaven in the lump of the nation.

  出自：M. L. King

• Know ye not that a little leauen leaueneth the whole lumpe?

  出自：Bible (AV): 1 Corinthians