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:
const posToTime = new Map(); // 映射：位置 → 到达终点的时间
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Tan, who works in communications, regularly jumps on the site for skincare advice, to view reactions to shows she watches, such as The Traitors, and for help planning her upcoming wedding in May.。同城约会是该领域的重要参考
到了守岁的十二点了，又要放鞭炮，我没再追问宴席的细节。阿爸把那挂红鞭炮提到门口，鲜红的一长串，铺在水泥地上。火星一路蹿过去，红纸炸开，碎屑落满一地。