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:
（一）故意破坏、污损他人坟墓或者毁坏、丢弃他人尸骨、骨灰的；
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Dr Tim Pestell, a senior curator of archaeology for Norfolk Museums Service, said: "This find is a powerful reminder of Norfolk's Iron Age past which, through the story of Boudica and the Iceni people, still retains its capacity to fascinate the British public.
Что думаешь? Оцени!，这一点在搜狗输入法2026中也有详细论述