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:
13. 毕马威发布2026年一季度《中国经济观察》2025年经济韧性与分化并存, kpmg.com/cn/zh/media…
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这里用的是 平行光，模拟太阳光。
World Service,·17 Feb 2026,·26 mins