名词
中文翻译：极地正常
同义词：
['polar norm', 'polar normality']
例句：
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1. The Arctic region is characterized by its polar normal climate.
北极地区以其极地正常气候而著称。
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2. The research team found that the polar normal temperature had a significant impact on the ecosystem.
研究小组发现，极地正常温度对生态系统产生了显著影响。
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3. The polar normal phenomenon has been studied extensively in recent years.
近年来，极地正常现象已广泛研究。