n.雪球；打雪仗；滚雪球式的募捐法
v.向 ... 丢雪球；使生长或快速的增长
He was hit by a volley of snowballs. 他被一阵投来的雪球击中了。
We like having snowball fights in winter. 我们喜欢在冬天里打雪仗。
用作动词 (v.)Orders for the new product have begun to snowball because of our new ad campaign. 由于我们的新的广告促销活动，新产品的订货单开始像滚雪球一样迅速增多。
