名词
中文翻译：宇宙平均密度
同义词：
['cosmic mean', 'cosmical mean例句：1. The study of cosmology is essential for understanding the origin and evolution of the universe.（研究宇宙学对于理解宇宙的起源和演变至关重要。）']
例句：
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1. The study of cosmology is essential for understanding the origin and evolution of the universe.
研究宇宙学对于理解宇宙的起源和演变至关重要。
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2.The cosmological principle states that the universe is expanding.
宇宙膨胀原理表明，宇宙正在扩张。
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3. The cosmological constant is a fundamental constant in the theory of general relativity.
宇宙常数是广义相对论理论中的一个基本常数。