地球与太阳是生命的两大源泉。
古埃及人把太阳升起比作生命的开始，太阳落下比作生命的结束。
The ancient Egyptians compared the rising of the sun to the beginning of life and the setting of the sun to the end of life.
地球早期大气中的火山二氧化碳使地球足够温暖，保证生命在太阳过于昏暗而无法提供足够热量的时候能够得以孕育。
Volcanic carbon dioxide in Earth's early atmosphere kept Earth warm enough for life to begin during the time when the Sun was too dim to provide much warmth.
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