名词
中文翻译：天球
同义词：
['celestial sphere', 'celestial horizon例句：1. The astronauts were exploring the outermost layer of the solar system.（宇航员们正在探索太阳系的最外层。）']
例句：
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1. The astronauts were exploring the outermost layer of the solar system.
宇航员们正在探索太阳系的最外层。
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2.The horizon is a line that marks the boundary between land and sea.
地平线是陆地和海洋的分界线。
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3.The astronomers were studying the stars in the celestial sphere.
天文学家们在研究天球中的星星。