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:
Москвичи пожаловались на зловонную квартиру-свалку с телами животных и тараканами18:04
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带好工作证的Maggie姐站在一边，她的额头悄悄渗出汗来，这位身经百战的女强人难得碰上让她紧张的时刻。作为公关经理，她还要为查牌时间担忧。通常80个小姐的查牌时间是一小时左右，按每人500块计算，这一个小时里，公司至少将损失4万块。让Maggie姐惊喜的是，这夜的查牌时间仅为15分钟。
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我已经为整个流程准备好了 Notebook：。关于这个话题，heLLoword翻译官方下载提供了深入分析
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