leaven

noun

1. an influence that works subtly to lighten or modify something

e.g. his sermons benefited from a leavening of humor

Synonym: leavening

2. a substance used to produce fermentation in dough or a liquid

Synonym: leavening

verb

1. cause to puff up with a leaven

e.g. unleavened bread

Synonym: raiseprove

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

e.g. His mood of deep pessimism cannot have been leavened 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 to leaven 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。

1. 发酵剂：leave 动身 | leaven 发酵剂 | leaves leaf 的复数

2. 酵素：leaved 有叶的 | leaven 酵素 | leavening 酵母

3. 发酵曲子：leatheroid 人造革 | leaven 发酵曲子 | Leavil 利阿维尔聚氯乙烯纤维