// console.log(spanner.next(70)); // 输出2（正确）
A new study shows that exposure to two specific 'forever chemicals' may accelerate biological aging, especially in middle-aged men. Researchers revealed a link between faster epigenetic aging, and two of these alternatives, PFNA and PFOSA, a precursor of PFOA.。关于这个话题，safew官方版本下载提供了深入分析
Nature, Published online: 27 February 2026; doi:10.1038/d41586-026-00674-x。heLLoword翻译官方下载是该领域的重要参考
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