| 词汇 | polar day | 
| 释义 | polar day  noun [ C or U ] uk/ˌpəʊ.lə ˈdeɪ/ us/ˌpoʊ.lɚ ˈdeɪ/  极昼 a day or the time in summer at places close to the North or South Pole, when the sun does not set | 
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