2.[singular, uncountableU] literaryINTERESTINGHAPPY something that makes an event or situation less boring, serious, or sad 使事件[情景]变得有趣[生动]的东西;调和剂
Examples from the Corpus
leaven• A piece of dough was kept back after using the yeast and this is called leaven.• None rejoice more in this leaven than the professionalscholars themselves.• This leaven was added the next time baking bread was done.
leaven2 verb [transitiveT]
formalINTERESTINGBORING to make something less boring, serious, or sad 使有趣[生动]