名词
中文翻译：北极星
同义词：
['Polaris', 'Polarith', 'Polaris star']
例句：
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1.The constellation of the polestar is a familiar sight in the night sky.
北极星星座是夜空中一个熟悉的景观。
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2.The ancient Greeks believed that the polestar was the guiding star for their ships.
古代希腊人相信北极星是他们船只的导航星。
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3. In the northern hemisphere, the polestar is often used as a reference point for navigation.
在北半球，北极星通常被用作导航的参考点。