In areas of heavy snowfall, for example, the pitch is steep to prevent the accumulation of snow on the roof, snow that might eventually find its way into the house as it melts.

例如，多雪地区的斜坡陡，目的是要防止屋顶积雪或最终融化时有可能流人屋内。

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Perhaps most famously, heavy snowfall in New England led to the controversial 1982 Snow Plow Game, in which Patriots kicker John Smith hit a game-winning field goal only after a snowplow had cleared a spot for him to kick from.

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West and north Wales have been particularly affected by snow on Tuesday with reports of up to 3ins (7.6cm) deep in Bala and heavy snowfall in north Anglesey.

BBC: Forecasters warn of sub zero temperatures overnight