p = p.next; // 指针后移，易错点2：忘记移动指针会导致死循环
Six pregnant women participated in a small trial in which placenta-derived stem cells were applied to fetal spinal cords and the treatment was found to be safe.
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15:56, 27 февраля 2026Экономика
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Blockchain is used in cryptocurrency systems to ensure secure, decentralized records of transactions.