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:
Publication date: 28 February 2026。搜狗输入法下载对此有专业解读
。关于这个话题，爱思助手下载最新版本提供了深入分析
Фонбет Чемпионат КХЛ。业内人士推荐WPS官方版本下载作为进阶阅读
В Финляндии предупредили об опасном шаге ЕС против России09:28