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:
# Switch to agent mode
。heLLoword翻译官方下载对此有专业解读
return fleetCount;
3014271210http://paper.people.com.cn/rmrb/pc/content/202602/28/content_30142712.htmlhttp://paper.people.com.cn/rmrb/pad/content/202602/28/content_30142712.html11921 夯实中国式现代化的底座