名词
中文翻译：Unknown
同义词：
['polar aurora', 'polar caps例句：1. The auroral caps were visible from space.（从太空可以看到极光冠。）']
例句：
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1. The auroral caps were visible from space.
从太空可以看到极光冠。
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2. This is the first time I've seen the auroral caps in person.
这是我第一次亲眼看到极光冠。
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3.The auroral caps are fascinating to observe during the Northern Lights season.
在北极光季节观察极光冠令人着迷。