名词
中文翻译：Unknown
同义词：
['galactic', 'stellar', 'nebula例句：1. The Milky Way is a galaxy that contains billions of stars.（银河系包含数十亿颗恒星。）']
例句：
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1. The Milky Way is a galaxy that contains billions of stars.
银河系包含数十亿颗恒星。
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2. The discovery of the first galaxies in the universe has revolutionized ourunderstanding of the cosmos.
首次在宇宙中发现的星系，彻底改变了我们对宇宙的理解。
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3. The study of galaxies iscrucial for understanding the formation and evolution ofthe universe.
研究星系对于理解宇宙的形成和演化至关重要。