今天宇宙学的一个关键问题就是：宇宙中物质的平均密度是多少？
One of the key scientific questions in cosmology today is: what is the average density of matter in our universe?
标准模型将宇宙视为一个均匀结构，密度不会随著空间位置而变化，每立方公尺平均有一个原子。
Their standard model treats the universe as though its density did not vary from place to place but had a uniform, average value of one atom per cubic meter.
标准模型将宇宙视为一个均匀结构，密度不会随著空间位置而变化，每立方公尺平均有一个原子。
Their standard model treats the universe as though its density did not vary from place to place but had a uniform, average value of one atom per cubic meter.
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