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What I found is that written evidence for knocking on wood (and for the history of gesture as a whole) is remarkably sparse. In the Penguin Guide to Superstitions, folklorist Steve Roud offers a skeptical take on the provenance of knocking on wood due to the near total absence of written records about it:
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第一件事，是2026年1月，中科第五纪获得宇树科技“核心生态合作伙伴”称号。在To B及工业场景，中科第五纪目前作为宇树机器人的“大脑”模型供应商。