19版 - 德国电气与电子行业出口创新高

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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:

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That feeling of relative security has now been punctured by the violence of the past six months.

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