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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可“江湖”的惯性，远比一次功能更新更持久。某二手交易平台上，虚拟商品依旧活跃；新产品推出的“楼层级定位”“更强社交功能”，又在为这个数字小世界增添新的复杂度。这不禁令人思考：当功能性产品在技术的加持下不断强化“社交”属性，谁来为孩子们的“纯粹成长”留一方空间？