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:
Грудь напоказ и голые ягодицы.Кто из звезд оголился на «Оскаре»?3 марта 2025，详情可参考搜狗输入法2026
Jim Lovell, Fred Haise and Jack Swigert are rescued from the Pacific Ocean after their dramatic escape，这一点在搜狗输入法下载中也有详细论述
Москвичей предупредили о резком похолодании09:45。搜狗输入法2026是该领域的重要参考