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One lunar day is equivalent to four weeks on Earth, made up of two weeks of continual sunshine and two weeks of darkness. That makes relying on solar power very challenging.
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（作者单位：中国社会科学院考古研究所）
It's also worth noting that Amazon's investment in OpenAI will be staggered. The funding begins with $15 billion, but the remaining $35 billion will only be invested when certain conditions are met.
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