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:
Фото: Slawomir Kaminski / Agencja Wyborcza.pl / Reuters。同城约会对此有专业解读
，这一点在heLLoword翻译官方下载中也有详细论述
15:22, 27 февраля 2026Силовые структуры
原子能领域专业人才应当坚持立德为先、诚信为本，弘扬科学家精神，遵守学术和伦理规范，恪守职业道德。，这一点在搜狗输入法下载中也有详细论述