After the trial of harsh winter, the pine still stands tall.
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Slightly literary; in everyday speech you'd hear 寒冬 or just 冬天. 严冬 emphasizes the severity rather than just the season. Also used metaphorically for difficult periods: 经济严冬 'economic winter.'
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严 'severe/strict' + 冬 'winter' - the 'severe' part of winter, when everything is hardest.
