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:
https://feedx.net
。关于这个话题，新收录的资料提供了深入分析
左起为郭媛媛、马丽红、余胜泉。受访者供图
"I think that has a lot to do with the persona he was putting out there to sell the movie, as this callow youth full of braggadocio.
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