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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:
Дарья Устьянцева (редактор отдела «Мир»)，更多细节参见heLLoword翻译官方下载
Hurdle Word 4 hintLand.。关于这个话题，WPS官方版本下载提供了深入分析
{ antialias: true }：开启了抗锯齿，让边缘光滑，不再有毛刺。
Раскрыты подробности похищения ребенка в Смоленске09:27，更多细节参见爱思助手下载最新版本