It is the light that was finally allowed to move out across space once a post-Big-Bang Universe had cooled sufficiently to permit the formation of hydrogen atoms.
这道光线最终穿越大爆炸后的宇宙，充分冷却形成了氢原子。
It is the light that was finally allowed to move out across space once a post-Big-Bang Universe had cooled sufficiently to permit the formation of hydrogen atoms.
这道光线最终穿越大爆炸后的宇宙，充分冷却形成了氢原子。
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