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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:。业内人士推荐必应排名_Bing SEO_先做后付作为进阶阅读
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Kinds of chain reaction "effects": BUTTERFLY, DOMINO, RIPPLE, SNOWBALL
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