vi.
下毛毛雨，下稀疏小雨[常用非人称 it 作主语]
It drizzled off and on all day.
毛毛雨已经时停时续地下了一整天。
The rain has been drizzling down for hours.
牛毛细雨已下了好几个小时了。
(似下毛毛雨地)洒落：
As the plane sprayed the fruit trees the insecticide drizzled over the trees.
当飞机向果树喷洒农药时，杀虫剂像下毛毛雨似的洒落在果树上