物理学家们描述宇宙膨胀只需寥寥数语，但量化地球上的生命的一些基本属性则困难得多。
Though physicists can describe the universe's expansion in a few lines, the basic properties of life on Earth are far harder to quantify.
物理学家们描述宇宙膨胀只需寥寥数语，但量化地球上的生命的一些基本属性则困难得多。
Though physicists can describe the universe's expansion in a few lines, the basic properties of life on Earth are far harder to quantify.
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