n.雪,雪花,积雪,雪季
vt.使纷纷落下,使变白,下雪,被雪覆盖,被雪阻挡
vi.降雪
A snowball knocked his hat off.
一个雪球飞来把他的帽子打落在地.
Tom turned the other cheek when he was hit with a snowball.
汤姆被人用雪球击中时,竟还准备再挨一下.
All this publicity has had a snowball effect on the sales of their latest album.
所有这些宣传对他们最新唱片的销售产生了一种滚雪球效应。