a snowball fight的用法和样例：
- This snow's perfect for a snowball fight.
- This snow rs perfect for a snowball fight.
- The children were enjoying a snowball fight.
- A snowball fight ensues in a street in Crotone, in Calabria, southern Italy.
- Qiqi is waiting for his friend to throw a snow ball. But his friend is not in the garden. Qiqi cannot have a snowball fight on his own.