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尊敬的中国作者和评审人：AIP Publishing (AIP出版公司) 的论文发布系统（PXP）目前遇到一些技术问题。我们将为您尽快解决。因此带来的不便，我们向您表达我们诚挚的歉意！
Thank you for your patience during this process.
The ancient, metal-poor stars at the outskirts of the Milky Way provide a window on the conditions that governed the universe shortly after the Big Bang.
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