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:
Met arrests man on suspicion of racially aggravated criminal damage after slogans including ‘Zionist war criminal’ sprayed
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▲生成提示词：一张关于中国传统功夫茶道设计精美的垂直信息图。中国传统水墨画背景。顶部有巨大的、优雅的中文书法标题，明确写着「功夫茶」。向下有三个图文并茂的步骤：步骤 1 展示用沸水温杯，配有中文「温杯」；步骤 2 展示将茶叶放入盖碗，配有中文「投茶」；步骤 3 展示倒出茶汤，配有中文「出汤」。优雅、极简、温暖的大地色调，平衡的布局。。关于这个话题，一键获取谷歌浏览器下载提供了深入分析
Introducing the RayNeo Air 4 Pro smart glasses，详情可参考谷歌浏览器【最新下载地址】