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:
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Graphing — Axes, NumberPlane, FunctionGraph, ParametricFunction, VectorField, BarChart。搜狗输入法下载对此有专业解读
Lili BusbyBBC News NI，详情可参考搜狗输入法2026
加拿大人格雷格在广州旅居多年，日前到天津旅行。走进茶馆听相声，徜徉杨柳青古镇欣赏年画，跟着“泥人张”匠人体验泥塑制作……“这些民俗风情、传统技艺，无不彰显出中华优秀传统文化的深厚底蕴。”格雷格说。。雷电模拟器官方版本下载对此有专业解读
Equal (0): Everything in this space must be equal to 0. The answer is 0-0, placed horizontally; 3-0, placed vertically.