The study concluded that this was because people didn't go outdoors in winter unless it was absolutely necessary, and if they did, they dressed properly.
研究得出的结论是，在冬天人们除非绝对必须轻易不到户外去，如果要去的话，也须穿上合适的衣物。
The expression comes from skating outdoors in the winter on a frozen lake or pond.
这一短语来自冬季一项在结冰的湖泊或水塘滑冰的室外运动。
Like the outdoors came from the north wind cold, snowy night in winter hearth;
有如从朔风凛冽的户外来到冬日雪夜的炉边；
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