以下为句子列表：
英文: A light-year is about 6 trillion miles, the distance light travels in a year.
中文: 一光年大约6百亿亿英里，即光行走一年的距离。
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英文: The observable universe grows by a light-year every year as light from farther away has time to reach us.
中文: 可观测宇宙的範围，会因来自更远处的光线到达我们这里而每年向外长大一光年。
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英文: The visible universe contains at least 10100 bits of entropy, which could in principle be packed inside a sphere a tenth of a light-year across.
中文: 整个可见宇宙起码含有10100位元的熵，这麽多的熵原则上可以塞进直径为1/10光年的圆球内。
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