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Snowball Carsの旧いバージョンをダウンロードすることが可能
ここに自然な雪玉。
The ground must have a top layer of ice. This will prevent the snowball from sticking to the ground.
That ice must have some wet and loose snow that is near its melting point.
The wind must be strong enough to push the snowballs, but not too strong.