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总结
多家媒体报道，研究团队对约700万年前的“萨赫勒人”（Sahelanthropus）化石进行新的骨骼形态与受力特征分析，认为其股骨等肢骨显示出与直立行走相符的肌肉附着点与承重模式，提示早期人族可能已具备一定的双足行走能力，从而将人类直立行走的起源时间推得更早。由于化石归属、样本完整性及解释方法仍存争议，部分学者对其是否为最早双足证据保持谨慎。
正文
Evidence of upright walking found in 7-million-year-old Sahelanthropus fossils Phys.org When did humanity take its first step? Scientists say they now know. The Washington Post Fresh bone analysis makes case for earliest 'ancestor of humankind', but doubts remain The Guardian Earliest Human Ancestor May Have Walked on Two Legs Scientific American Controversial Ancestor Found to Have Done Something Eerily Human ScienceAlert
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