snow·ball /ˈsnoˌbɔl/
  雪球,打雪仗,滾雪球式的募捐法(vt.)向…丟雪球
  Snow·ball n.
  1. A round mass of snow pressed or roller together, or anything resembling such a mass.
  2. Bot. The Guelder-rose.
  Snowball bush or Snowball tree Bot., the Guelder-rose.
  a snowball's chance in hell, [Colloq.] no chance; an infinitesimal chance.
  Snow·ball, v. t. [imp. & p. p. Snowballed p. pr. & vb. n. Snowballing.] To pelt with snowballs; to throw snowballs at.
  Snow·ball, v. i.
  1. To throw snowballs.
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  snowball
       n 1: plant having heads of fragrant white trumpet-shaped flowers;
            grows in sandy arid regions [syn: sweet sand verbena,
            Abronia elliptica]
       2: ball of ice cream covered with coconut and usually chocolate
          sauce
       3: ball of crushed ice with fruit syrup
       4: snow pressed into a ball for throwing (playfully)
       v 1: increase or accumulate at a rapidly accelerating rate
       2: throw snowballs at